My limited experience with these systems is that they are usually viable for decades. Like anything else though things can go wrong and nothing lasts forever.
The controllers may be susceptible to moisure issues so they are better off installed in a dry closet not a laundry room or near a water heater.
Incorrect or low power batteries can cause issues with any system. It might be time to replace the charger. A new battery at the same time will eliminate doubts about that too.
Wireless items should be taken off-line for fresh batteries on a regular schedule if they are not connected to chargers.
That's all I think I know about that. Good luck!
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