Created attachment 92092 [details]
logs

Bisecting is quite tricky, I have so far only used the binary kernel packages. 
I can try, however it will probably take a long time until I find something
useful if at all. I am not sure when I can call a version good because
sometimes the system can run fine for multiple hours and only then start having
these freezes.
I currently don't have the time to bisect, so I was hoping there would be some
kernel parameters to increase verbosity.

Would running a debug kernel be of any use?