Because it’s essentially a tablet, and I have seen this in tablets and phones before, due to batteries, I’m fairly certain now that’s the issue.
This. I recently had the same thing happen to one of my IQ Remotes that had been in operation for over 5 years. I was able to conclude that it was a panel issue because I swapped the power supply with an identical unit, and that did not resolve the problem. Battery is the prime suspect, particularly given the age of my unit. Ultimately I just bought a new one (latest model) and now all works fine, plus the benefits of better wifi security and dual band, which solved a couple of unrelated networking issues specific to my home.