(In reply to Kacper Pluta from comment #13) > Guys I am sorry for the confusion. I ran into other problems with the laptop > and today I checked the RAM with Memtest+. The outcome of the test is that > one of the RAM modules is broken. I think it is the reason of all the > problems. I will test everything for a few days but I guess the problem is > solved. > > Sorry for the bug report. I should have checked the hardware in the first > place. Of course I have removed the faulty RAM ;-)(In reply to Kacper Pluta from comment #13) > Guys I am sorry for the confusion. I ran into other problems with the laptop > and today I checked the RAM with Memtest+. The outcome of the test is that > one of the RAM modules is broken. I think it is the reason of all the > problems. I will test everything for a few days but I guess the problem is > solved. > > Sorry for the bug report. I should have checked the hardware in the first > place. I wonder why the problems happened more often with 4.4.120, but anyway I removed the faulty RAM module and I hope it is going to be OK now.