[CRITICAL] VM's in Paused-Critical State

Server 2012 R2 with hyper-v host on server core.  In hyper-v manager:

I login to the hyper-v host and dir the C drive and have 213,557,248 bytes free! Yes, the VM's are located on the C drive. This host has been running fine with the same amount of VM's for months! It looks like something took up all the space. How do i find out what is hogging the space?