There were several VRF related changes in 8.0, you should at least be on 8.0.4.1.
Also, you should check out the site.xml file. In VRF, go to a floor plan, then click anywhere in the floor plan to make sure the floor plan is the active frame, then key press: ctrl+x+m+l. This should launch a new tab displaying the site.xml. Look for the client, and check what neighboring radios hear the client and strength of the signal.
Otherwise, open a support case to debug further after upgrading.