I’m facing the same or a similar issue for almost over a year now. It appears only to happen when the phone is actively used (unlocked).
Entering CrashDump Mode reset_reason: Panicking, remoteproce: 400000.remoteproc-mss crashed.
Had very intensive contact with support - had to send my phone to a repair center multiple times - having my firmware reset - having the motherboard replaced and eventually having the whole phone replaced. On the replacement phone I’m still experiencing the same issues. Makes it either an issue that is not device-specific but Phone 2 specific - or a software issue.
Saving crash dumps and bug reports and going through all of that does not show any reason for panicking - other than ‘remoteproc 400000.remoteproc-mss crashed’ - which tells me nothing.
After all of this I’m considering changing to a different brand as this phone appears not as reliable as I want it to be.