LP Detector Exhibiting Flakey Behavior. Any ideas?

[Jack and Liz Pearce]

Howdy, Y'all.

In our 1993 Wanderlodge, the LP gas detector has been sounding off
lately. When that happens, I go out into the kitchen to check. But I
can't smell anything amiss. That stinky smell of a propane leak isn't
present. Sometimes the detector goes off for about 5 seconds then
stops. This happened at 1 AM Wednesday. Between 1-2 AM, it sounded
about 4 times.(didn't wake Jack up though!) Last night, around 9 PM it
went off again. We waited to see if it would stop but it didn't. Jack
turned it off for the night. At 11:15 AM, today, I turned it back on.
This behavior is occuring more often in the last 4 months. Jack is
wondering if the sensor of the detector is failing. As far as we know,
this detector is original to the coach.

Any ideas as to how we troubleshoot this annoying problem?

Thanks,
Liz