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If this unit is programmable, then maybe there's a backup battery somewhere that needs changed. Otherwise, any time the main unit lost power, the memory would dump and the unit would have to be reprogrammed to recognize the remotes. It may be something like a 9V battery, or it could be a couple D cells, etc. If you have the manual for the unit, see if it mentions a backup battery.
I hope this helps some. Regards! Jim D/Heathsville, VA