Can't launch any apps after a while (Service not found)

Could you please provide the output of:

df -h

?
This issue reminds me of this (and a few others similar):

If you get something like (100%)

tmpfs 0,8G 0,8G 0 100% /run/user/1000

You’d better enlarge your tmpfs as suggested (you could use 4G in your case).

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