Do you have any codes? The High beam on our cars are part of the bi-xenon system, meaning it's the same bulb as the low beam, and there's a moving piece that blocks the rest of the beam in low beam mode. Sounds like for some reason, your blocking piece inst moving up. I'd look for FRM codes on the car first.

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'10 X5 35d- 279k mi, deleted and DUDMD stage 2, daily and tow vehicle
'01 330i- Drift car: SLR Super angle, BC coils- keep it simple
'07 335i 6mt - Sold @ 171k miles- stage 2 daily commuter for 2 years