we had the same problem, which rooted in automatic MA deployment upon RSD detection. We simply disabled MA automatic deployment as a workaround. Also we noticed that when we upgraded our ePO 4.0 to 4.5, the RSD install package in Master Repo did not get upgraded. I had a support chat and finally managed to replace the package with the RSD 4.5 (resulting in updating sensors as well). I have not re-enabled the MA automatic deployment ever since, so I cannot tell, whether the two issues coincide or not.
Then you might as well mark this thread as answered, so that others can see and read.