FTFSLATER

I have tried mode switching bit the blue LED never blinks only a purple LED. One unit works fine on its own the problematic unit has problems on its own or with another. This problem has been from first use

I have just bought two G30 systems, one works fine with no issue. the other suffers from intermittent signal drop outs. i have tried all suggested fixes with no joy. Dose this sound like a RF1 /RF2 problem, i Live in the UK but bought the systems from Germany, if i cant sort the problem i will have to send the unit back and it will be a few weeks before i can get a replacement. Please help