hi sebastian_holocafe,
Thanks much for replying to me.
I am actually also aware of those 2 cases as you stated. AFAIK, the first one indicates that the IR cams failed to track, hence loss of positional movement (while IMU should be still working fine). The second one is more related to the application level, to our use case, we are using Kiosk mode with a single content (which is our own app), sometimes the loading persists even after rebooting, ended up we had to factory reset it.
From what I've seen so far, yeah, the first loading case (black screen with loading spinner) happens randomly, I am trying my luck here to see if someone has a suggestion how to minimize the chance of occurrence at least.