one of our 900 mhz fisher-price baby monitor receivers no longer connects to the base unit. Every so often it emits about 5 beeps and the word reception flashes on and off...... have tried re-syncing by turning base unit off and back on..... the one working receiver syncs back up again as it should.... but the other one does nothing !! What is the matter and how can it be fixed?? Thanks, Paige Nixon vnixon1@roadrunner.com 1-207-998-4923