I rarely ride at night 'cause of all the deer around here.
I got caught out after dark:30 and wanted to try the brights, holy bovine batman those are bright!!!
Switched back to normal and no lights at all.
Switched back to brights so I could see (I'm in town blinding people

) switch back to normal still nothing but dark.
Did this a few times and finally the lights came back on without being on brights.
Does the switch need cleaned?
Both bulbs were replaced last fall with Silvania Silverstars and the bulb adaptors.