Bill,
How to stop it? Locate the source and clean it up.
I assume you are finding it on the floor. Are you finding it near a storage door? Maybe up against the carpeted bulkhead wall?
If it seems to be coming from behind the bulkhead wall, remove the panel and vacuum the floor back there. Be careful to not bump some of the stuff back there (converter, vacuum cleaner, water heater, water pump, water lines etc.).
If it seems to be in front of the doors, then it is likely trapped in the walls where it meets the ceiling of the storage area. Seal this area with caulking.
Should this be happening? Not in an ideal world. But that it is, you should be able to track it down and clean/seal and for the most part, eliminate the situation.
Jim