Is your UHD722 loaded with 1.0.9 firmware? It solved a lot of issues for me, but even still the UHD722 is my least favorite Meridian device. I had hoped it would work with a lot fewer issues than it does. I too get "white snow" or blank screens from time to time and I have to cut the power from it to reset it, though I don't have to do it as frequently with the latest firmware. I still wish I never had to.

G65, DSP5200SE, DSP5000SEHC, UHD722, 210