@bla1
Fine, you 'solved' it on your own.
Good, as I had no idea. Just would have thought the same way as you to check /home/user/.rtcom...

@szopin
Did you check with top and/or htop about memory resources?
I could think of some process still running and trying to do something but failing and hereby -due to good/tested SW - leaking.
I will switch mine on too. But use it rarely.

--
So I need some 'assistance' on your side.
First above mentioned mem checks. -- also 'cat /proc/swaps' may reveal something
Does this pop up after some time or after some dedicated action? Any regularities?