Looks mechanical. Is it always that corner no matter the print? Check everything where the stress changes as the toolhead moves.
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Your comment made me think it might be stripped teeth on belt(s) or gear(s)
From a 3d printing perspective, I have absolutely no idea.
But from the perspective of troubleshooting electronics, that's a pretty awful situation: electrical shocks can cause all sorts of weird havoc with unpredictable behavior and unintuitive symptoms. If I was in your situation I would seriously consider cutting my losses short and replace ALL of the electronics and save myself from a major headache.
Source: I was tasked with fixing an MF/HF radio station that had been struck by lightning. And the ship it was on was only available around 0300 in the morning. I replaced so many components, including the ones that threw an error, but to no avail. I ended up replacing the entire station, antenna and tuner included.