Hi, sorry for bumping this, but we're also getting this issue, but I believe I have a bit more info on the setup, here it goes:
We have 2 VIVE HMD from 2016 and 4 VIVE HMD from 2018 (not Pro), here's what happens when we setup VIVE in the same area as the Optitrack system (Prime13 cameras):
-Setup area with the 2018 base stations (3x3 LED array)
-Turn on Optitrack system, then this happens:
-> 2016 VIVE works properly (even with the new base stations)
-> 2018 VIVE looses tracking
Have the sensors also change for the HMD?