I just got a Vizio HD tv for christmas and the controller worked for one night and then the next day I had to be within 4 feet of the tv for the controller to work.I have changed the batteries,rebooted the tv by unplugging and plugging it back in...it hasn't been dropped or gotten wet...Any suggestions?? oh also emailed the co. they don't seem to know what is wrong with it.They are the ones that told me to reboot it.