But if that were the case, simply leaving it powered off for a while and then turning it back on should fix it, but it doesn't. As I mentioned, I have to re-flash them from scratch with Android before I can reinstall Armbian.
Additionally, the boards are completely exposed (out of the casing), with a heatsink on the SoC and proper ventilation. The power supply shouldn't be the issue either, as it is also fully ventilated.