I have an r70 and it has been great. About two months ago it would just go pop and not receive. The s meter was still lit, but the frequency lights would not come. After turning it off and then back on it would restart. Now it won't even do that. The s meter is on , but nothing else. When you turn on the power switch, you can hear it come on, but no frequency lights and no receiveing. Is this possible the memory battery or something bigger?