I was "trying" to watch a Kung Fu movie on NTD yesterday and was getting a burp every 10-20 seconds. I scanned around and only noticed it on that transponder. But later, I had it on Abu-Dhabi and it was doing it too. I changed to IA6 (Doc) and had no problem. I went back to IA5, then the wife called me for something and haven't been back again to check it. Hopefully, it was just some anomaly. Once I figure it out, I'll post what happened (if I can find anything).
Well I ended up checking all my connections from the receiver to the motor to the switch to the LNB. I didn't find anything in particular that was wrong, but when I returned into the house, IA5 was solid and hasn't missed a beat.