@Adam_Hupp
Since you have a consistent repro case could you try downloading and installing the intel power gadget
https://software.intel.com/content/www/us/en/develop/articles/intel-power-gadget.html
And then running the following command:
“C:\Program Files\Intel\Power Gadget 3.6\PowerLog3.0.exe” -resolution 100 -duration 600 -file cpulog.csv
Which will log your cpu speed, temperatures, and throttling for about 10 minutes.
If you can start this as soon as the system boots, and capture a log of the system performing normally and then transitioning to the low frequency state it would be helpful for us.
If you can share the csv with us we can take a look and see if we can find the source of your throttling.