I’m not sure it’s all about the switch. There are few strange experiences:
In Modes from standby I click once. Moonlight comes up, switch flashes three times and the light goes off. Sometimes it does this way, sometimes it turns on.
In Modes from standby I triple click - seems like nothing happened. Looking on the led, it’s in moonlight and before I could turn away it burns my eyes.
So delayed, sudden and surprising answers coming from the light in Modes.
The D shaped boot activation pad is catching on the side of the driver, delivering an unusual pressure that may stay applied for a short time after you click resulting in the driver “thinking” a different action was required from what you intended. The boot needs to be rotated slightly so that the flat top side of the D shape can clear the driver, you should have no problems after that.
You can probably use a sharp wood chisel to slightly raise the retaining ring, bump the chisel in slightly from each side to give some wiggle room for the boot, then align it. Try it in action and see if it is fixed, if so, tap the retaining ring back in.
Ok, then your issue is same that me and some others had, button does not register clicks etc… but weird did u use the light and no issues since sept 2018 and suddenly problems? My issue started probably just a few weeks after i got mine from Neal during group buy hardly used, i got a new head replacement which i requested. Maybe try request it to banggood also but i dont know how they will deal with this problem now?
If you pulled the rubber cover out completely you should be able to take a small flathead screwdriver & slowly pry the retaining ring up by going around it from the inside & gently lifting as you go until it loosens & comes out.