Welcome to Manjaro!
Please read this:
and post some more information so we can see what’s really going on. Now we know the symptom of the disease, but we need some more probing to know where the origin lies…
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An
inxi --admin --verbosity=7 --filter --no-host --width
would be the minimum required information… (Personally Identifiable Information like serial numbers and MAC addresses will be filtered out by the above command) -
Please read this:
[HowTo] reboot / turn off your frozen computer: REISUB/REISUO
P.S. If you enter a bit more details in your profile, we can also see which Desktop Environment you’re using, which CPU/GPU or Kernel you have, …