Some users have reported that the tracking cameras have gotten white dots in them from sun exposure, but the units that I've seen generally have a few dots in the periphery straight from the factory, so I think they're just not noticing until after. You rarely use the passthrough view, anyway, so it isn't a huge deal, generally.

Other than that, I can't really think of anything off the top of my head. I know someone who uses one on a trampoline in the heat of the summer to cheat in a video game; Q2s are surprisingly durable little things.

Just don't stare at the sun, I guess.