No, ur not the only one experiencing this. I've noticed this lately, over the past several months, around 6pm Eastern, when live TV channels seem to just freeze/crap out for around 5-15 mins or more, on a couple of MAG254 STB's, 75-100Mbs, hard-wired, different geo locations and ISP's.
I've also noticed similar / predictable freezing approximately 2 minutes before the top of the hour, at various times throughput the day and evening, on live TV channels, where it requires either going into the EPG/ Guide, pressing the right arrow on the remote a couple of times, then backing out, or changing the channel with up or down arrow, then returning to the channel that froze at 2 minutes before the top of the hour in order to get it to resume playing again.
Weird, and annoying, isn't it?