I presume your Bavaria has the Rutgersen hatches installed.
I had a similar experience with one of my hatch handles, the result of being pulled down too vigorously or forced against the lock buttons. This requires a crew awareness session!
I found swapping it with a little used handle was the answer, and when re-installing, carefully apply some Araldite glue to the screw thread making sure you have rehearsed the reassembly properly.
Rutgersen of Sweden carry most spare parts but they are always very expensive.