Well don't know if this is any help, I am in Toronto on Rogers, and my host lists as channel 8, which is CTV.
I had a good run, 2 months, and haven't read much here until today, and from what I read Adyu is the only one on track here........there is no fix.
I am lucky to get passed 8 days, than after this point, when it goes down, it will states "rebulilding....." or "there is no data......". Machine usually comes back within a day or two. I stopped worrying, and schedule furiously during week1 after reset.
As Sean explained, the hit comes when all scheduled programs go gray, and the unit has lost all epg data, including searches. Then the data never comes back, and the reset is the only out.
My experience, after reset, is no channel listings ever, or data. If i wait an hour or two, and turn on, channels have populated, with "no listing" in every slot. Let it go longer , and they fill days 1,2,8.
Another problem i've had is timer freezing displaying "tmr ready" on unit, and the programmed shows just wipe off the list as time go by, and nothing records, until i press stop record. This happened 3 times in 5 months (disapointing).