First off, this isn't a troubleshooting post. I just found it really interesting and wanted to share.

Some of the keys on the keyboard are not working. I opened the device and reseated the connector (ribbon cable). It works fine. For a while...

Problem comes back. I had decided to flash the system with new win 11 (not for the purpose of troubleshooting btw, just needed a win 11 laptop).

I used an external keyboard to do this. Which worked fine.

Boot new system. The internal keybaord is working fine. Then stops working. Same problem. Only some keys work.

Weird Part:

The keys which work on the internal keyboard, DO NOT work on the external keyboard. And vice-versa.

I just thought it was interesting.