ICS disconnected ceiling screen off (around 20 seconds) if screen not sleep it works

Hi,

I have installed GT-P7500 Samsung Galaxy Tab 10.1 (P7500) from Thai official firmware (android ICS 4.0.4) using KIES and then flashed Enable Voice Call (For [ROMs based Samsung Stock ICS 4.0.4 Deodex OR Odex]). http://forum.xda-developers.com/show....php?t=1875024

My problem :

- Will disconnected ceiling screen off (around 20 seconds) if screen not sleep it works fine.

Have more call settings?

Thanks,