Yes, it seems there are a few race conditions that can present themselves putting the PDU into an inconsistent state.

The end result is that all the values it gives out are 0 (see the screenshot I posted a week ago)

The only solution is to do a hard reset

The cause is probably related to mains net pollution. This could be a high power device like an airco switching on and off on the same circuit on your fuse box. Perhaps the spike only presents itself once a while and that is why you did not notice until now. It does not look to be software related.

Perhaps batch #2 and batch #3 will ship with a different design (some difference appear from the released diagrams)

Try to clean up your mains net as much as possible to play safe