Sammy - if the main car battery is low the radio will not work or can be on reduced power - it is a protection system to ensure enough power is available for the car's crucial systems.
My battery is 7 years old the car only does short trips and I often get the low power message or the radio does not work but it comes back after a moderate distance drive and the battery gets more power back.
Three failures of the radio (did they work when removed from the car and bench tested) does not seem to be a radio problem to me but a car problem.
If you go an aftermarket system you may loose some functionality in controlling the message center as the radio is integrated in the CANBUS system.
Get your battery checked.
Garry
REMLR 243
2007 Range Rover Sport TDV6
1977 FC 101
1976 Jaguar XJ12C
1973 Haflinger AP700
1971 Jaguar V12 E-Type Series 3 Roadster
1957 Series 1 88"
1957 Series 1 88" Station Wagon
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