The signal strength is showing 10 10 so is fine, it has a new uhf aerial with no other aerials attached.
I have always set the units to "power save on standby" as this only uses 1watt (it is claimed to be a green machine) and switches of the clock display, I'm just wondering if 1watt is to low a power setting and makes them unstable. I also have the clock set to auto so it gets it's time from the transmitter.
I have just switched off the power save option and will see how it behaves, at least I can see what the time is, and if the timer symbol is lit.
If I had the choice I don't think I would buy one of these again, It is giving me the same headaches my Ultra Plus gave me until I found an firmware that suited it.
PS I have it running of a UPS just in case the voltage is a problem.