Losing specific A-Record over and over

For a few weeks now, an A-record has been automatically deleted after a few minutes or hours. I have even deleted the zone completely for 24 hours and then set it up again, but the problem remains with exactly the same record!

The problem only exists with “wiki.domain.com” and does not occur when I create the record “test.domain.com”, for example.

While you write about an A Record, this looks very similar to AAAA record got lost
“cloud” was one of the records most frequently described as lost, also for me. Maybe wiki is another one.