To be clear, it is no longer supported at this time to operate the cell manager on W2012.
W2012 is still supported as a client and for EADR.
Whether not your problem is a legit problem with EADR of W2012, or is a result of the IDB problems for which W2012 support for the cell manager was dropped is hard to say until you get your cell manager moved to a non-problematic platform.
Thanks,
Scott