I was similarly unimpressed with the very same issue back in 2017 when my motorhome was 4 years old.
In my technically orientated mind, I had imagined that any mechanism related to the operation of the airbag would utilise an electro/mechanical inertia switch of some kind, but no, the mechanism is operated by springs, rubber bands, baling twine and simple contact switches. I exaggerate somewhat but the system is unnecessarily complicated and generally rubbish.
There was no owner/handyman fix for the problem, and the local Fiat dealership, in who's clutches I was at the time (due to the failed MoT) charged me £700 for the fix.
I was more than likely ripped off, so I do not use that dealership any longer.
I am now in the clutches of another garage, following a succession of warning lights and system failures which have been traced back to the ABS pump.
I expect to be ripped off once more.
I can safely say that I have been unimpressed with just about every aspect of the reliability of this vehicle since day one.
I wish I could advise you on this issue, but sadly I can not.
Endov.