A few people have malfunctioning keys of a particular group, which points to the problem being in a shared line in the key matrix. The line either making intermittent contact, or being broken for 100% dead keys that include all that share the line.
Forum says I’ve read all but the most recent posts here, but I must have either not or read too fast.
Anyone that has multiple intermittent or dead keys, when they act up, please check every key including rarely or never used ones and post the list of effected keys.
You can compare the list to this chart of the key matrix column & rows: Framework Laptop Key Matrix :: HowettNET. Rows are along the left side, columns are along the top.
D, Enter, Delete, Backspace, ' , =, and ] all share the column line 14. You didn’t mention ' , =, and ] so check those any time your keys act up.
P, 0 (zero), -, [, ; all share the column line 13. Any time your keys act up, check all of those.
Now, for anyone who finds a shared line as a problem, there are places that should be more likely to be the issue. 1) Your ribbon cable, carefully look for tears near the curve, I recall a few people discovering that they accidentally caused a tear. Also look for creases. A crease could have a break in the wire inside while the outer surface is intact. Either tears or internal breaks at visible creases could make intermittent contact. 2) The connector soldered to the ribbon cable, a solder point could be cracked. Harder to check for most people. You’d need strong magnification. This could also make intermittent contact. 3) Connectors on the touchpad board where the keyboard lines travel through. Again, a solder point could be cracked, making intermittent contact. 4) less likely I would think, but possible there is a break in the line somewhere inside the keyboard.