Update: - I've now got a tiny red LED ( light ) that appears on my 630, this started happening this morning.
That LED indicates you have lost signal. It sounds like your dish may have come out of alignment, or else something might be blocking the signal (leaves on the trees?). The recording issues are consistent with this.
Check signal in OPTIONS 4-7. It's on line C and E. You generally want an Ecb/no value above 8.0 on SD channels, and above 6.0 on all the HD channels.
If it's low, give Shaw Direct a call and we'll get things resolved for you.