[Xiaomi Redmi 2] Bottom buttons not working - Device Repair

Hello all!
I'm having a strange problem with my Redmi 2 (aka Wingtech WT88047). My bottom buttons stopped working a couple weeks ago. As my phone was rooted, I decided to activate the software keys adding qemu.hw.mainkeys=0 to build.prop and commenting out hard buttons actions, since I prefer them anyway.
After a while, they became unresponsive too. They work again once in a while, but most of the time they don't.
Okay, so what's strange about that? The strange part is that the button bar area IS working while in lock screen and when using fullscreen apps. I even wrote a simple app to test touch points and the entire touch screen area is fine. While in fullscreen mode, I can even swipe the bottom border to bring up buttons or swipe the navbar to activate one handed mode, but the buttons still don't work.
They work fine while on landscape as long as the buttons are located on what would be the top area in portrait mode.
After that, I tried going back to hardware buttons, only to find out with further investigation that they also work only now and then, but not most of the time (like the soft keys).
I rebooted, soft rebooted, removed battery, sim and sd cards, reseted, tried different roms and all to no avail.
I'm currently using LineageOS if it helps.
Any suggestions? Thanks in advance

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