I have a pronto pro which has been working fine, however it has stopped talking to the remote extender. I have a second PP and this has stopped also. I hvae a powermid and it talks to this fine. I am told by the supplier of the RF extender that is is working fine but I still cannot get them to talk anymore. If I reset the extender I can pass 1 command and then nothing. The light is permanently on, on the extender is this normal?