Initial Camera Lag Zoom Rooms

Hello, we're having a very frustrating issue with our Zoom Rooms. We have Logitech Tap VU0053's, mini PC's and either Logitech MeetUps or Logitech Rally's (MeetUp seems the worst affected) cameras. Every time a Zoom call starts, it can take up to 30 seconds for the Zoom Room (Logitech) camera to appear. You'll hear the audio, and once connected there's no delay.

We've tried moving and changing practically every variable without success. I can't think what else it can be. The only things I can think of are:

A couple of the Logitech Tap's have issues

A couple of the Logitech camera's have issues

There's some bizarre inconsistent network issue

Please help us out, it's been driving a team of 4 crazy for a week! Has anyone seen something similar?

Thanks