I saw a corrected memory error logged every few hours when my current machine was new. It seems to have gone away now, so either some burn-in effect, or ECC accidentally got switched off and all my data is now corrupted. Threadripper 7000 series, 4x64GB DDR5.

Edit: it's probably because I switched it to "energy efficiency mode" instead of "performance mode" because it would occasionally lock up in performance mode. Presumably with the same root cause.