Wow, never heard/thought of that. I guess I've been lucky with my GRE500, I know that's happened a few times and it's still working. I'll make a mental note to remember that with the new SDS100. Thanks for the heads up.
I do that all the time with my PSR-500, and I've done it with the SDS-100 as well since getting it.
I guess I'm going to have to remember to turn them off before unplugging them and plugging them back in.