I have had spiders spinning webs over the sensors in my van, that sets the alarm off.
Have also had it set off by a moth. hides in the day time, comes out after dark and flutters around over the sensor.
We had a similar thing on our Elddis & it seemed to cure itself after our next trip out, so the only thing I could think was the corner steady alarm switch sticking. Might be worth winding all of your legs up & down a couple of times to see if that cures it ?
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Thanks for all the replies, checked everything could not find the problem, until tried your idea scooby 61173.
Wound the legs up on the drive, wound them down again, that was last week and not a false alarm since.
Thanks scooby 61173!