Sure, I hear you re: Apple forums. Already contacted Apple multiple times (including the 2 times spent on the phone with tech support which led to the 2 keyboard replacements). We have done nothing to our iPads (i.e. no screen protectors), so they either have a serious hardware defect problem they're failing to acknowledge, or there is clearly some software-related bug. We are not using any unusual third party apps... we're only using Apple apps and/or Top 10-level third party apps (kindle app, Notability).
And, again, I would suggest: Apple should acknowledge/explain this bug, even if they're convinced it's caused by certain apps not handling keyboard/lighting properly (i.e. software bugs).
Apple's response has been non-existent, other than sending these keyboards and us being told "there's no official report/response to this issue" whenever we've spoken with Apple tech support.
Which is why there are so many frustrated Apple customers saying "WTH Apple?!" Very disappointing.
And in answer to your last question: SOMETIMES the lights go out when you lock. And then sometimes they stay on. When they stay on, any adjustment of the keyboard light level slider has no effect. A clear indicator that it's once again gotten "stuck" in that buggy mode. The only solution is to disconnect and re-connect the keyboard. Which is a nuisance at best. But when the lights decide to go on while it's already closed and you're not around to see it, thats when it really drains your battery and you return to a dead ipad.