Well after further testing, the recording issue with back to back recordings on the same channel is reproducible. I ended up submitting the following to the My Q&A forum:
After installing the 1.8.2 version of the firmware on my 3310, I noticed a problem with back to back recordings on the same channel. For example, I setup a show to record from 5:00 - 5:30 and a second show to record from 5:30 to 6:00 on the same channel. The first recording works just fine, but the second recording stops after 12 seconds an the unit shuts itself down. If that second show is shift to start a minute later, I.e. 5:31, then it records fine, but I lose the first minute. It also works if that second recording is for a different channel starting at 5:30. It looks like it may be an issue with the unit not recognizing that the second recording is going on since the channel didn't change, and the unit is doing the normal shutdown after finishing the recording.