MoCa Issue

Prior to today, all was well. Had an issue with cable, and was serviced today -now have the following issue:
Four TiVo's - (2) XL4, Bolt, Roamio Pro
The Bolt and one of the XL4's cannot communicate with each other. However, all other boxes can see the other three (and stream). The Bolt and the XL4 in question can see and stream from the other two. The ONLY issue is between the Bolt and the XL4. I have rebooted modem, router, MoCa, and DVR's numerous times. Any suggestions?

Thanks in advance!