I'm having a problem with my Samsung D.Tv tivo model S4120 which is plugged into the wall plug and is grounded,in the last 2 or 3 months I'll be watching a recorded show & even once when watching a live program all of a sudden with no warning whatsoever it will suddenly just lose power & then it will go thru the process of powering back up and rebooting, once it's done and it comes back online it works ok until the next time it decides to do this,I've only noticed it doing this since either Dec or Jan and it's only done it 3 times over that time span as far as I can remember ,could I have a M.B. or P.S. problem or is this a H.D. problem ? I know that the H.D. in it is a 200 gb replacement I had you guys program for me either early last yr or in 06 and it didn't seem to start doing this until just recently, if it's a M.B. or P.S problem I have a Samsung S4080 unit without a H.D. so could I just swap the M.B. or P.S. from the 4080 into the 4120 if one or both of them are the problem ?