Are 'back-facing hits' errors always from reflections?

[paulasheville]

I have gray screen issues with Vive Pro and wireless, and am seeing the 'back-facing hits' errors in the logs at the time of gray screen. I have read online that these errors are usually resulting from reflections issues, but I have to the best of my knowledge covered all reflections in the room, and am still getting them. Here is an example of the errors:

Wed Feb 09 2022 10:23:56.855 - lighthouse: LHR-2AF5C70F H: Resetting tracking: no optical samples for 2026ms
Wed Feb 09 2022 10:23:56.855 - lighthouse: LHR-2AF5C70F H: Dropped 1992 back-facing hits during the previous tracking session
Wed Feb 09 2022 10:23:59.336 - lighthouse: Lighthouse IMU HID device error
Wed Feb 09 2022 10:23:59.336 - lighthouse: LHR-D037FD3F: Disconnected from receiver 853EDFCBD0
Wed Feb 09 2022 10:23:59.336 - lighthouse: LHR-D037FD3F C: Tracking thread peak duty cycle 92% (over 4.8s).  Blocked in SendOnPoseChange 0% of that.
Wed Feb 09 2022 10:23:59.336 - lighthouse: LHR-D037FD3F C: Dropped 81 rejected updates, 102217 back-facing hits, 3 non-clustered hits during the previous tracking session
Wed Feb 09 2022 10:23:59.434 - lighthouse: LHR-B289FDD1 C: Tracking thread peak duty cycle 98% (over 4.5s).  Blocked in SendOnPoseChange 0% of that.
Wed Feb 09 2022 10:23:59.434 - lighthouse: LHR-B289FDD1 C: Resetting tracking: no optical samples for 4612ms
Wed Feb 09 2022 10:23:59.434 - lighthouse: LHR-B289FDD1 C: Dropped 81532 back-facing hits, 7 non-clustered hits during the previous tracking session

Any help is greatly appreciated!

[HackPerception]

@paulasheville Yes, they're generally reflections. It can be tricky to nail down base station reflections because we can't see in IR, but this technique can be helpful.