Live Link Body And Face - Can't Evaluate Frames

Hi there - Recently I've been having trouble getting live link data through to my rigged character.

As of earlier this week face eye and body tracking we working as expected, but suddenly and without changing anything I've been getting "Can't evaluate frame for 'Face' and 'Body'"

A few days ago these were working fine. Occasionally restarting my computer allows both Face and Body to work as expected, but more often than not, only the Body will work and not the face.

I've been running it in VR Preview for UE 5.3 without changing any project settings, it just stopped working.

Any advice would be greatly appreciated!