Bluetooth connection allows touchscreen to be active while holstering

[gdanonym]

While my phone is in the case for holstering, and the phone is in my pocket, i notice the touch screen becomes active after getting an active bluetooth connection. I will step into my car then, with a parrot bluetooth handsfree kit.
Sometimes my phone starts dialling, but sometimes when i check my phone, some apps had started to some screens. So i guess the touch screen has been released and made some random touches.
This is also strange, because the case i have is a pdair flip case, and the screen is capacitive. So maybe the magnet in the flip cover is doing the damage.

Can anyone help me resolve this problem?
Is there an app which keeps the screen non-active while holstering and bluetooth connection. I think it's only the problem when the bluetooth actually connects and disconnects. And then for the period of the screen timeout.