What part(s) to replace?

On my third Quest 3 in 2 years 3 months. Replaced by Meta. They’ve all failed similarly in that they are working as expected, put on a charger and show boundary or tracking issues on next use. Software reinstall and factory restore either don’t solve the issue or brick the unit.

Current unit followed same flow except I’ve been able to get it partially working but not usable after multiple restores and software reinstalls.

it will boot but shows Finding Position in Room. Then without interaction it will show the menu bar at the bottoms, then flash back to Finding Position. Pass through works intermittently. When it does work the room has waves, jumps between zoomed to unzoomed views, sections of the room to sides flash in front of me, the view has fractures in it, there are what are best described as lightening bolts across the screen with combined views of what’s in front of me and to the sides. Menus, if I can get them to come up, slide in and out of view or change distances and positions, controller functionality is intermittent…the list goes on. I’m sometimes able to get it stable enough or click fast enough to get to some menu choices so have cleared and tried to reset the boundaries although redraw may not have completed. No experimental features are on so “lie down” is not enabled but I’ve been able to reset the experimental features (none were enabled)

No external damage to any of the cameras. The device has never been dropped. If i try long enough to work through menus the top front gets very warm/hot which I think is where the heat sink is located.

Is this all due to a failed tracking sensor? Bad mb? Both?