Past week, while on a journey (Murphy Laws Seal of Approval), my TOHKBD2 started to suffer the "keyboard connected/keyboard removed" issue.

I removed and attached the TOH part several times and it's working fine now. I bet it's related to the I2C physical connection, since I saw lots of messages about that into DMESG log.

Luckily, that TOH is one of the few parts in my Jolla that can be replaced (thanks to 3D printers).