This was fixed with the CU7

an update on this issue

We set up a load testing environment and easily reproduced the issue after some hours. We halted the test and recover the database to start with...

Thanks for the reply. Do you have documentation in regards to the Bug you're mentioning?

We're having the same issue with one of our environments. The only workaround until now is to reboot. We just installed the latest CU, but there is nothing in the...