BTOR ECI modem - no DSL light after power cycle

Had a weird one earlier. I unplugged the BTOR modem for a moment to move the power arrangements around. Upon plugging it back in, 10 minutes later there was no DSL light. I tried power cycling again, 10 minutes later and still no DSL light.

Eventually holding Reset did the trick, I'm just curious whether this is a known/common issue that I should look out for, or whether its a precursor to further sync issues down the line.