I recently started having problems with my Magnum 257HP. It's currently set up for CON 3. However today I noticed when you switch the radio off at the on/off knob, it goes back to the default of 29.300 FM. I did a search to see if there's a back up memory battery that needs replaced (similar to the RCI 2950's) but didn't see anything. Can anyone please let me know why this all the sudden has started and what can be done to fix it? The radio is only a year and a half old. Thanks in advance.