In a car radio there are 2 power sources.
One in on when the key is on.
One is on all the time so the clock and radio preset memory
On a Concertone there is only one power source as far as I know.
Since you are shutting off the concertone using the remote
or power button on the face- the radio station preset memory should work unless you shut
off the main power to the unit. This would be like pulling
the fuse in the fuse box or turning off your battery switch if
you have one.
Sounds like another Concertcrap is getting ready to bite the dust!
And you're "just" out of warranty!
If it makes you feel any better, there are many, many of us out
here that have not had good luck with ours either.
They are IMO the single biggest complaint generator over all.
There used to be a tech who lurked here.
He worked as a repair technician for Forest River.
They laid him off when the economy tanked......
Several here have replaced their units with a Jensen AWM970 or 950
There have been several threads here in the tech forums about
Dan & Rita D
2004 5.3L Silverado 1500 ext. cab 2WD
1999 Suzuki Intruder Motorcycle
Blue Ox WD hitch, AirLift load levelers
Camping days 2010-53, 2011-47, 2012-41,
2013-41, 2014-31, 2015-40, 2016-38