[LG G PRO 2- D838] Serious connevtivity issues after upgrading to loolipop and back topic

Hello Guys,

I'm deeply frustrated with this issue. I have a LG G PRO 2(LGD838) bought in HongKong a couple of weeks ago.
I recently upgraded, manually, to version 5.0.1 from KK and ever since, the internet connectivity has major issues.
Internet works often, even when it does, it works SO slow!

I flashed back to stock KK - v4.4.2 by using this .kdz file - D83810D_00.kdz
but problem remains!

PLEASE HELP ME!!


Thanks in advanced.

Nir.