Just an FYI, nitecore never botherd to get back to me or comment in anyway, and doesn't look they they have made a appearance here to, either they don't know what's wrong, don't care, or its a much larger issue that has effected a lot of the HC90's they have sold and they are trying to work out what to do / how to fix the situation so have not said anything it yet.
Either way I'm glad I jumped ship, maby they will sort it out maby not, I'm not to fussed either way but hope you get it sorted guys!
Seems me and nitecore are never destand to be be LOL, as last night core light I was gonna buy was a EA4 when I first got into lights, ended up with a SWM D40A instead, guess what, switch issues put me off LOL, looks like I have managed to swerve a nitecore switch issue twice now!!
I know they did fix the EA4 but from my point of view not a good track record LOL, guess I'll just stick to other bands ahaha. Maby one day I'll try one of there lights!!!