Issue with screenlock when calling / being called

[XBWillem]

When I start to call someone, the screen directly goes on screenlock. When I bring the phone up to my ear, nothing changes. When I move the phone away from my ear, back to waist heigth, the screen is still on lock... only after about 5 seconds the screenlock stops.

Is there a fix for this?

I have the idea this started happening after I started using a click-on case for my phone.

 

[XBWillem]

Does anybody know anything about this? The issue is really bothering me.

 

[SolunaKitty]

I have never had an issue with the screen locking up without me wanting it to. How odd.