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It COULD be caused by your box not receiving reliable data from your network. I struggled with a similar problem - guide info would not update, or say data not available, and my box would lock up about every 8-12 hours. It turns out that using my already installed coax distribution system was the problem.
Your internal coax cable distribution system has to be really good to pass the interactive program guide info to the STBs. The actual TV signals pass at lower frequencies, but the IPG is passed at near 1GHz. Standard coax distribution systems for cable frequently use splitters only good up to 600 or 900 MHz, not good enough for FIOS Program Guide info and Home Media functions.
Additionally a number of my coax connectors were old and loose and under a lot of strain - they were replaced with crimped connectors and provided some slack, and one length of coax running through an inaccessible wall was simply intermittent - seemed fine for actual TV signals and when the tech sent a test signal, but still resulted in IPG problems and a locked-up box regularly.
Eliminating the unnecessary splitters, replacing the rest with 1Ghz-pass-through types, replacing all of the coax connectors and that one run of bad coax cabling, resulted in perfect perfomance of the STB.