Phone freezes frequently after MM update

I did a clean install of MM (factory reset and cache erase). It seemingly works fine but it keeps freezing at least once a day. Yesterday it froze in the middle of GTA 3 game, and today it did the same after a call was finished. Sometimes after being left aside for a couple of hours, it doesn't turn back on by either double tapping or pressing the power button so I had to force a reboot.

None of these issues were present before the update.

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