I had a similar issue on my ESM while I was on 9.4 hotfix 3. It caused major issues, but luckily 9.4 hotfix 4 fixed it.
There's a KB article on it:
In my case i have 9.3.2 hotfix 11, and the problem originates in the ELM, I don't know if an upgrade will fix the problem. i did not find anything related in the known issues.