Samsung UE32C4000

Had T.V. for about two years...No problems until the end of August 2012. This set did an excellent job with all sources,P.C. USB...scart..HDmi. The picture quality and colour is excellent. I was really pleased with Samsung....Suddenly the source has started switching by itself ...Even if I remove cables and switch off everything the problem is not resolved (leaving one source on) It still periodically switches from the cable to CHECK CABLE /Check signal....I have also checked the obvious..batteries in remotes....

I would respectfully ask potential buyers to check to see if these problems have been resolved.

Possible CAUSES.......(Speculation ) Could the change be to do with the analog / digital switch which occurred in my area recently ? What other signals might randomly communicate with my T.V.? I recently installed a P.C. emulator in my Apple computer and noticed that the blue screen (which comes up just before the p.c. is connected.) has also randomly l flashed on the T.V. screen as I switched on the emulator...Can neighbours wifi effect my source switching signals ?