I'm watching a movie ((931 Outmax HD) and at exactly 1:00 AM the picture freezes. I tried to change to another channel and nothing - screen went black. I could press Play/Pause and it would show the info line at the bottom of the screen, but still no picture. After about 15 minutes, the picture was back.
I've only had FIOS TV for a few weeks and have been pretty disappointed in the number of times the picture just freezes. Is this normal?
No, it's definitely not normal. It is very rare for me to get the issue that you are describing, and usually has to do with a channel outage in my area. Where you indicate that you changed channels and still got nothing, I would lean towards a signal outage in your area. Being late at night, there would probably be fewer reportings. The fact that the channels came back without taking any steps to fix the STB/DVR also leads me to believe it was a signal issue. If it happens again, post more details and see if anyone else has better answers than I do.
Here is a link that will provide you with more information and a trouble-shooter.
To the OP, it is likely a signal issue (as mentioned) caused by a loose or corroded coax connector somewhere on the path between the ONT and the STB. Problems on one or more channels is a common symptom of this phenomena due the the wavelengths of the QAM channels involved. Reseat and tighten all coax connectors and it may solve the problem. It did for me when I had a similar issue.