Report "I have a set of unwired 2- way frs radios, they have hardly been used, in mint condition. Problem is that the volume on one radio is very low. Have to hold it up to your ear to hear anything. Volume is turned up all the way, and both radios are on all the same settings. Battery switch is on batt ,as I am using AAA batteries. What might be the problem??? (model UFR-650)"