Headlight problem on 250

[is250maxs]

Suggestions on headlight issue

My passenger most days will not turn on. Once in a while it will turn on when I turn the car on, most days it’s off. But sometimes if I’m lucky I can turn the headlights off for bout 20 seconds then turn them back on and they will both be on. 

I’ve changed the bulb twice and the ballast once

I haven’t taken the headlight completely out but nothing looks wrong with it from outside or in the engine bay. no cracks or water in it

Any help would be great thanks

[RX400h]

Welcome, Max. Have you checked the electrical connectors for loose fits or corrosion?