It’s confirmed, my QNAP NAS died a horrible death last night after an attempted firmware upgrade. Searching on Reddit it seems I wasn’t the only one who had an issue:

Luckily I recently backed up the data from the QNAP so I think I’m in good shape. I don’t think I want to shell out $$$ for another NAS, though. I may go back to simple hard drive enclosures.

Dusty QNAP NAS