[Q] wi-fi reconnects one time after sleep... annoying...

ok, i started to get a bit pis**d off by this bug...

i've tried several roms (cloudy3.3, somboons stock, somboons thai food ones) and i still can't trace what is causing this...

here is the situation:
device is in screen off/sleep mode, wi-fi is turned off in sleep (no data is turned on - and that is ok)
when i turn the screen on - wifi turns on after few seconds - that is ok

after a minute or so - wifi turns off by itself, and reconnects again - and it stays on until i turn the screen off...

at first - it didn't bother me much, but it just started to get annoying and it pis**s me off because i can't find the culprit of that bug...

i've tried several things:
- reflashing the roms (clean flash)
- removing xposed mods one by one (i use 3 of them - g3tweaksbox, flat style indicators and xtoast)
- stock and dorimanx kernel
- changing wifi router channel (i'm running dual band router - 5ghz/2.4ghz, it makes no difference on which band i'm connected)

did anyone else notice this bug?
i googled like a MF and the closest thing i've found was connected to nexus devices on lollipop (similar reconnection issues, but worse)

thanks in advance...