Proximity sensor stops working

[Immortalis]

Hello guys,

I've got a problem with my Nexus 5 - after few hours of being powered on and idle, the proximity and light sensor stops reporting anything and reboot is needed to restore them (eventually, the problem returns and another reboot needs to be done in order to make them work again).
At the moment I'm at Marshmallow, build MTC20F, kernel ElementalX-6.27.
I tried to change baseband and bootloader, but it didn't help.
Is it possible to get rid of this without downgrading system to KitKat?
Thanks in advance.

 

[audit13]

Does the same problem happen on stock MM? If not, I would conclude that the custom ROM is not fully compatible with the phone.