Hey there! Since ~3 weeks I’ve been experiencing similar issues, so I opened up a post at this forum. It turns out many more people has been running into the same, and we’ve been sharing our experiences since then. We’ve not found an effective solution yet, but hope you can find some useful information over there! Feel free to provide any ideas or issues you may face 
https://forum.manjaro.org/t/system-frequently-crashing-after-gpu-drivers-update
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