James Pain composed on 2021-11-08 22:15 (UTC):
TLDR; what log files are important when troubleshooting an issue in TW.
journalctl
You may not discover anything useful if the problem is a failing power supply, motherboard, or RAM. Run memtest86 (not memtest86+) if you have DDR4 to ensure RAM is OK, at least 4 full passes (preferably 8 hours or more). If your power supply is out of warranty, open it up, make sure it's clean, and visually inspect for leaky and/or swollen electrolytic capacitors[1]. If the motherboard is older, it too may have bad caps. Most newer boards have polys instead of electrolytics for the important ones.