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Hi,This is somewhat similar to what I was experiencing when I first started using LL. I was getting an error message in the syslog (Start / System / System Log - I suggest copying it to a text window, as it updates often), which suggested a kernel bug relating to the X window manager (X.org). Since about kernel 4.4.109 I had system freezes instead. These may have been unrelated, but it meant I didn't pursue the problem further, as curing the system freezes seems to have cured this issue also.The system freezes were triggered by something Task Manager was doing, which I was running continually. May I suggest keeping a record of every time this happens? Note down things like:-The exact data and time (to the second), so that you can check the system logs for any error messages,Note what app(s) you have running at the time, even if they appear unaffected,Note the app(s) which appear to be affected,Note what you were doing at the time.Eventually, it may be that some pattern appears.Hope that helps.
sudo apt install powertop