H20-100 hang between channels

I've only had my H20-100 for about three weeks, but I've noticed that it will occasionally hang when I'm switching from a SAT channel to an OTA channel. It only occasionally happens, and not always with the same channels. Only once did I have to perform a reset. On all other occassions it would hang for up to a minute, then the OTA channel would be acquired. While hung, I receive a black screen with the channel banner, and no remote or box inputs are accepted. Signal strength for both SAT and OTA signals are very high for my big 4 networks. I've tested the scenario against a couple very weak OTA signals from distance stations, just to see if that was the cause (slow acquisition of signal), but I could never force the box into a hang-up where inputs were not accepted.