Receiver does random things while I'm watching it

Lately my receiver has been doing random things while I'm watching it. Mainly it either changes channels or it starts recording programs without me prompting it to. The other night I was watching a show on my dvr and every 5 seconds or so the tv would make the *bong* noise that it makes when you prompt it to do something that its not capable of doing. I've reset the receiver, rebooted it, and even reformatted it so that I ended up losing all my dvr shows and scheduled recordings. I live in a house so I don't think its someone else interfering with my signal, and the receiver in my bedroom doesn't have any problems. I've also taken the remote to other rooms in the house and the receiver still acts wild. Is my box just defective?