Lamp works when cable is bent a certain way, or flickers when you tilt your head.
If the switch is failing, it can be difficult to replace due to the specific height of the original micro-switch. Some users suggest cleaning the dome spring of the switch as a simpler fix. Critical Safety Note HELP! Petzl Myo XP malfunction - UKC Forums - UKClimbing petzl myo xp repair 2021
: He carefully stripped the tiny wires, mindful of the fuse near the battery terminal. Lamp works when cable is bent a certain