When I turn on my PR180 (auto mode), it seems to work one time... and then gets "stuck" with the light on.

I can see into the closet under the door, so I can tell what the light is doing without triggering the sensor.

Turn switch to auto... sensor senses me and turns on.
Leave the closet... light turns off after 20-30 seconds
Sometimes (most of the time) after about 10-15 seconds, light comes back on for 20-30 seconds and then goes off.

If it goes through the sequence above, the sensor seems to work (as long as I stay in the closet for less than 20-30 seconds). If I go into th closet for longer than the "timer" time... light never seems to go out again?

I have actually taped over the sensor... when it goes through the cycle one time... it never comes on again since the sensor is covered... but a few times it has NOT gone through the sequence and stays lit.

Manual on off works fine.

I'm in an old house and the ground and/or electricals may not be the most stable, BUT I have modern TVs appliances and motion detecting outdoor lights that don't have any issues.
Help... THANKS

Just curious, but do you happen to have a cat that likes to roam about or sleep in a clothes basket inside the closet?