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raspberry pi running Ubuntu Server suddently stops being reacheable on network, system time clock jumps backwards

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I hope this is the correct place to ask help for an intermittent issue I have been having for the past months:

My setup consists of a raspberry pi 4b running ubuntu server 22.04, which I use as NAS and DNS server (pihole). It works wonderfully except for very far between instances where it just isn't reacheable by network anymore. Since rpis don't have an internal clock which persists upon restarts I have added an RTC module (RS232), and it has been working just fine.

Now, here is a log of what happened right before the last time the issue popped up, and it makes me think there is an issue related to my clock module, or system clock in general (output of journalctl for the problematic timeframe). These are the full logs to make sure I didn't take out anything important

journalctl logs

my system information:

Linux rpi-nas 5.15.0-1022-raspi #24-Ubuntu SMP PREEMPT Mon Dec 5 09:58:33 UTC 2022 aarch64 aarch64 aarch64 GNU/Linux

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