I've Had This Issue On The Past, This is really dependent on which is causing this

i can tell you for a fact its most likely NOT you needed new basestations or more

first thing i would ask of you to do, is check your valve index wire. that is the most important step, wiggle it around, wiggle it from both right near your index display port, and your headset to PC adapter port, if you wiggle it in any sort of way and you grey screen and 1/2 of your controllers loses tracking, then you found your issue, your index cable itself is the problem

i say check that point first because: (the headset it'll show my display under my play space or it'll stutter trying to track my headset and cant remap itself to me standing) if your vive trackers 3.0 aren't doing it or your controllers aren't doing it, and only your headset does that, its most likely the wire

(If it so happens to be the wire) double tape is your best friend, i personally have a pulley system, all of my wire usually just goes straight up, after i got this issue that you have, my problem was at the headset port of the wire, so i basically used double tape to hold it in place (In My Case Being It Being Re-Routed to the top right of my headset instead of top left)

i say this because i had the same issue before, if you don't have wire problems, i still doubt you would need more base stations, i hope this is able to fix your problem, but if not, i do hope you find a workaround/fix