I have the Quest 2 with the official Link Cable to clarify.
Probably NOT your issue, just throwing this at the wall, hoping it will stick...maybe? If running the "Challenge Sound Pak", maybe happens regardless..but if you take off the Headset, you lose Motor,Actuators and other sounds. Voice/Vox still comes through. My set up HATES Teamspeak and Discord Apps..not sure why..but it messes things up every time(maybe issue).
I used to get disconnects when in Ship Guns, or at Large Airfields. YES Black Screen..with the 3 dots and a grid pattern, for me and RiftS. Have you check with "Oculus/Meta" volume controls? For RS...Devices:Headset and check Volume defaults? Also, with RiftS, for me...the Black screen means, a reset of Safe Zone is in order, or a Touch Controller Battery is low.AH will be full screen on monitor...headset...Sounds but still Black Screen with those 3 dots thing.
Hold down SHIFT while shutting down and changing USB slots before Restart fix it for a while...like you said, "Sometimes this works for WEEKS" Just spitballing! You situation has me befuddled. It SUCKS! VR is a game changer and I hate to see My Brethren struggling with it! Its NOT FAIR