Strange issue, my 2012 hyperV server is running 4 servers 2008 mix with 2012.

one of my 2012 servers started acting strange towhen i RDP it, only shows a bday, and i have no checkpoints to revert since it's only been live for about 1 week.  When I RDP to the server (used to work) I get a black screen with the arrow then after about 1 min I get a failed to connect try again later. When I connect via hyper-v manager I can log in but my mouse is gone i see a dot, which moves with the mouse but doesn't give me any functionality.

I rebooted everything both server and hyper-v server and nothing, both are 2012 and updated.  I have seen old posts having similar issues, but their RDP works.  Any ideas what I can try before I revert to reformatting.

I've also done a check dsk and a /sfc scannow.