Mi 9 restarts by itself

Hey guys,
I have a problem with my mi 9 (128gb).
I was in MIUI 11.0.6 EEA and now on the Rom Pixel Experience from 2019/12/09

The problem is on both Roms, that the phone restarts suddenly without any warning or exception.
Maybe Up to 5 Times a day.
Theres no longer Uptime for me than 6 hours.
Then it crashes and reboots again.
The only information I have is out of the logcat below.
Looks Like it comes from magisk. But it also happened without magisk.

I am afraid, maybe its a Hardware...

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