I've been having this weird issue where the screen goes black when in call and I'm unable to do anything but simply wait for the call to end and the lock-screen to come up so the screen lights up again. I'd noticed this happening randomly with the MIUI ROMs (rare case), but since I've enabled true dual boot it seems to happen only for the first call I do after reboot (on system one). My problem is more on system 2, where I have the (sort of) stock android ROMs. If I flash QDT14 it seems to work just like the MIUI one, where the first call has a black screen and functions well for the rest of the calls, but every single other ROM (Mokee, Cofface's, GDroid) has the black screen issue and it doesn't go away. I've already tried to disable \ re-enable true dual boot factory reset, wipe caches, reflash QDT14 and flash others over it and probably plenty of other stuff and I have no idea where the issue comes from since no one seems to have it. Does anyone know what's going on?