In case anyone cares, I have reported the driver crash to Intel via the Linux Kernel bugzilla. The ticket can be found here.
I switched the NetworkManager backend from wpa_supplicant to iwd (see e.g. this guide) and my connection seems a bit more stable.
I’m curious if anyone else sees similar output from iw phy0 channels:
iw phy0 channels output
Band 1:
* 2412 MHz [1]
Maximum TX power: 22.0 dBm
Channel widths: 20MHz HT40+
* 2417 MHz [2]
Maximum TX power: 22.0 dBm
Channel widths: 20MHz HT40+
* 2422 MHz [3]
Maximum TX power: 22.0 dBm
Channel widths: 20MHz HT40+
* 2427 MHz [4]
Maximum TX power: 22.0 dBm
Channel widths: 20MHz HT40+
* 2432 MHz [5]
Maximum TX power: 22.0 dBm
Channel widths: 20MHz HT40- HT40+
* 2437 MHz [6]
Maximum TX power: 22.0 dBm
Channel widths: 20MHz HT40- HT40+
* 2442 MHz [7]
Maximum TX power: 22.0 dBm
Channel widths: 20MHz HT40- HT40+
* 2447 MHz [8]
Maximum TX power: 22.0 dBm
Channel widths: 20MHz HT40- HT40+
* 2452 MHz [9]
Maximum TX power: 22.0 dBm
Channel widths: 20MHz HT40- HT40+
* 2457 MHz [10]
Maximum TX power: 22.0 dBm
Channel widths: 20MHz HT40-
* 2462 MHz [11]
Maximum TX power: 22.0 dBm
Channel widths: 20MHz HT40-
* 2467 MHz [12]
Maximum TX power: 22.0 dBm
Channel widths: 20MHz HT40-
* 2472 MHz [13]
Maximum TX power: 22.0 dBm
Channel widths: 20MHz HT40-
* 2484 MHz [14] (disabled)
Band 2:
* 5180 MHz [36]
Maximum TX power: 22.0 dBm
No IR
Channel widths: 20MHz HT40+ VHT80 VHT160
* 5200 MHz [40]
Maximum TX power: 22.0 dBm
No IR
Channel widths: 20MHz HT40- VHT80 VHT160
* 5220 MHz [44]
Maximum TX power: 22.0 dBm
No IR
Channel widths: 20MHz HT40+ VHT80 VHT160
* 5240 MHz [48]
Maximum TX power: 22.0 dBm
No IR
Channel widths: 20MHz HT40- VHT80 VHT160
* 5260 MHz [52]
Maximum TX power: 22.0 dBm
No IR
Radar detection
Channel widths: 20MHz HT40+ VHT80 VHT160
DFS state: usable (for 429 sec)
DFS CAC time: 60000 ms
* 5280 MHz [56]
Maximum TX power: 22.0 dBm
No IR
Radar detection
Channel widths: 20MHz HT40- VHT80 VHT160
DFS state: usable (for 429 sec)
DFS CAC time: 60000 ms
* 5300 MHz [60]
Maximum TX power: 22.0 dBm
No IR
Radar detection
Channel widths: 20MHz HT40+ VHT80 VHT160
DFS state: usable (for 429 sec)
DFS CAC time: 60000 ms
* 5320 MHz [64]
Maximum TX power: 22.0 dBm
No IR
Radar detection
Channel widths: 20MHz HT40- VHT80 VHT160
DFS state: usable (for 429 sec)
DFS CAC time: 60000 ms
* 5340 MHz [68] (disabled)
* 5360 MHz [72] (disabled)
* 5380 MHz [76] (disabled)
* 5400 MHz [80] (disabled)
* 5420 MHz [84] (disabled)
* 5440 MHz [88] (disabled)
* 5460 MHz [92] (disabled)
* 5480 MHz [96] (disabled)
* 5500 MHz [100]
Maximum TX power: 22.0 dBm
No IR
Radar detection
Channel widths: 20MHz HT40+ VHT80 VHT160
DFS state: usable (for 429 sec)
DFS CAC time: 60000 ms
* 5520 MHz [104]
Maximum TX power: 22.0 dBm
No IR
Radar detection
Channel widths: 20MHz HT40- VHT80 VHT160
DFS state: usable (for 429 sec)
DFS CAC time: 60000 ms
* 5540 MHz [108]
Maximum TX power: 22.0 dBm
No IR
Radar detection
Channel widths: 20MHz HT40+ VHT80 VHT160
DFS state: usable (for 429 sec)
DFS CAC time: 60000 ms
* 5560 MHz [112]
Maximum TX power: 22.0 dBm
No IR
Radar detection
Channel widths: 20MHz HT40- VHT80 VHT160
DFS state: usable (for 429 sec)
DFS CAC time: 60000 ms
* 5580 MHz [116]
Maximum TX power: 22.0 dBm
No IR
Radar detection
Channel widths: 20MHz HT40+ VHT80 VHT160
DFS state: usable (for 429 sec)
DFS CAC time: 60000 ms
* 5600 MHz [120]
Maximum TX power: 22.0 dBm
No IR
Radar detection
Channel widths: 20MHz HT40- VHT80 VHT160
DFS state: usable (for 429 sec)
DFS CAC time: 60000 ms
* 5620 MHz [124]
Maximum TX power: 22.0 dBm
No IR
Radar detection
Channel widths: 20MHz HT40+ VHT80 VHT160
DFS state: usable (for 429 sec)
DFS CAC time: 60000 ms
* 5640 MHz [128]
Maximum TX power: 22.0 dBm
No IR
Radar detection
Channel widths: 20MHz HT40- VHT80 VHT160
DFS state: usable (for 429 sec)
DFS CAC time: 60000 ms
* 5660 MHz [132]
Maximum TX power: 22.0 dBm
No IR
Radar detection
Channel widths: 20MHz HT40+ VHT80
DFS state: usable (for 429 sec)
DFS CAC time: 60000 ms
* 5680 MHz [136]
Maximum TX power: 22.0 dBm
No IR
Radar detection
Channel widths: 20MHz HT40- VHT80
DFS state: usable (for 429 sec)
DFS CAC time: 60000 ms
* 5700 MHz [140]
Maximum TX power: 22.0 dBm
No IR
Radar detection
Channel widths: 20MHz VHT80
DFS state: usable (for 429 sec)
DFS CAC time: 60000 ms
* 5720 MHz [144] (disabled)
* 5745 MHz [149]
Maximum TX power: 22.0 dBm
Channel widths: 20MHz HT40+ VHT80
* 5765 MHz [153]
Maximum TX power: 22.0 dBm
Channel widths: 20MHz HT40- VHT80
* 5785 MHz [157]
Maximum TX power: 22.0 dBm
Channel widths: 20MHz HT40+ VHT80
* 5805 MHz [161]
Maximum TX power: 22.0 dBm
Channel widths: 20MHz HT40- VHT80
* 5825 MHz [165]
Maximum TX power: 22.0 dBm
Channel widths: 20MHz HT40+
* 5845 MHz [169]
Maximum TX power: 22.0 dBm
Channel widths: 20MHz HT40-
* 5865 MHz [173]
Maximum TX power: 22.0 dBm
Channel widths: 20MHz
* 5885 MHz [177] (disabled)
* 5905 MHz [181] (disabled)
Band 4:
* 5955 MHz [1]
Maximum TX power: 22.0 dBm
No IR
Channel widths: 20MHz
* 5975 MHz [5]
Maximum TX power: 22.0 dBm
No IR
Channel widths: 20MHz
* 5995 MHz [9]
Maximum TX power: 22.0 dBm
No IR
Channel widths: 20MHz
* 6015 MHz [13]
Maximum TX power: 22.0 dBm
No IR
Channel widths: 20MHz
* 6035 MHz [17]
Maximum TX power: 22.0 dBm
No IR
Channel widths: 20MHz
* 6055 MHz [21]
Maximum TX power: 22.0 dBm
No IR
Channel widths: 20MHz
* 6075 MHz [25]
Maximum TX power: 22.0 dBm
No IR
Channel widths: 20MHz
* 6095 MHz [29]
Maximum TX power: 22.0 dBm
No IR
Channel widths: 20MHz
* 6115 MHz [33]
Maximum TX power: 22.0 dBm
No IR
Channel widths: 20MHz
* 6135 MHz [37]
Maximum TX power: 22.0 dBm
No IR
Channel widths: 20MHz
* 6155 MHz [41]
Maximum TX power: 22.0 dBm
No IR
Channel widths: 20MHz
* 6175 MHz [45]
Maximum TX power: 22.0 dBm
No IR
Channel widths: 20MHz
* 6195 MHz [49]
Maximum TX power: 22.0 dBm
No IR
Channel widths: 20MHz
* 6215 MHz [53]
Maximum TX power: 22.0 dBm
No IR
Channel widths: 20MHz
* 6235 MHz [57]
Maximum TX power: 22.0 dBm
No IR
Channel widths: 20MHz
* 6255 MHz [61]
Maximum TX power: 22.0 dBm
No IR
Channel widths: 20MHz
* 6275 MHz [65]
Maximum TX power: 22.0 dBm
No IR
Channel widths: 20MHz
* 6295 MHz [69]
Maximum TX power: 22.0 dBm
No IR
Channel widths: 20MHz
* 6315 MHz [73]
Maximum TX power: 22.0 dBm
No IR
Channel widths: 20MHz
* 6335 MHz [77]
Maximum TX power: 22.0 dBm
No IR
Channel widths: 20MHz
* 6355 MHz [81]
Maximum TX power: 22.0 dBm
No IR
Channel widths: 20MHz
* 6375 MHz [85]
Maximum TX power: 22.0 dBm
No IR
Channel widths: 20MHz
* 6395 MHz [89]
Maximum TX power: 22.0 dBm
No IR
Channel widths: 20MHz
* 6415 MHz [93]
Maximum TX power: 22.0 dBm
No IR
Channel widths: 20MHz
* 6435 MHz [97] (disabled)
* 6455 MHz [101] (disabled)
* 6475 MHz [105] (disabled)
* 6495 MHz [109] (disabled)
* 6515 MHz [113] (disabled)
* 6535 MHz [117] (disabled)
* 6555 MHz [121] (disabled)
* 6575 MHz [125] (disabled)
* 6595 MHz [129] (disabled)
* 6615 MHz [133] (disabled)
* 6635 MHz [137] (disabled)
* 6655 MHz [141] (disabled)
* 6675 MHz [145] (disabled)
* 6695 MHz [149] (disabled)
* 6715 MHz [153] (disabled)
* 6735 MHz [157] (disabled)
* 6755 MHz [161] (disabled)
* 6775 MHz [165] (disabled)
* 6795 MHz [169] (disabled)
* 6815 MHz [173] (disabled)
* 6835 MHz [177] (disabled)
* 6855 MHz [181] (disabled)
* 6875 MHz [185] (disabled)
* 6895 MHz [189] (disabled)
* 6915 MHz [193] (disabled)
* 6935 MHz [197] (disabled)
* 6955 MHz [201] (disabled)
* 6975 MHz [205] (disabled)
* 6995 MHz [209] (disabled)
* 7015 MHz [213] (disabled)
* 7035 MHz [217] (disabled)
* 7055 MHz [221] (disabled)
* 7075 MHz [225] (disabled)
* 7095 MHz [229] (disabled)
* 7115 MHz [233] (disabled)
It seems as if only 20 MHz width channels are supported in the 6 GHz band.