Hi Gerry
you should try reinitializing the unit to factory defaults, using the full erase/reinit method. It will erase your presets, if you have creted/stored any.
Power the unit on w/the 8 key pressed & held. Follow the instructions on the display.
You may also want to upgrade your unit as it must be on a very old OS version. Shortly we'll be releasing V3.5. You need to register your unit and creat an account on our website to get the new OS.
all the best
I