WinRM load CPU 100%

I have 9 Domain Controllers 2012 (not R2) and one DC 2008R2 in one Domain. Damain has 5 sites. There are some trusted domains. All DCs are VirtualMachines on VmWare. Damain and Forest tevel - 2008R2. 

All 2012 DCs have the same problem. WinRM load CPU on 100% and DC doesn't answer on requests, ping works, RDP try connecting but can't sign-in. The problem appear randomly (not simultaneously) on all DCs. DC 2008R2 works good.

I dasabled WinRM on all DCs and users can works but I need WinRM.

Thanks!