I have a Motorola 905 Sidecar and recently it is losing signal a few times when I tune in a satellite. I notice it most on T4. This morning I tried to tune the NW Cable News on C4 and it would lock for an instant and then go away. The remaining signals show a 60 signal level, the two analog signals are quite strong, and the DVB channels are also strong. What are some possible issues with the 905?