Defy 4.4.2 slimkat does not wake up screen - Defy Q&A, Help & Troubleshooting

Hello,
Recently I have installed slimkat 4.4.2 on my old Defy MB525.
Kernel 2.6.32.9-Aerokernel
After the screen turns off (due to time lapsed or pressing the power button) I can't have it back on.
I tried everything but the phone keeps "locked" with the screen off.
Even if there is a incoming call the screen keeps off.
I have to take out the battery and start the phone again to see the screen turning on.
Have you noticed something like this before??
Thanks a Lot in advance.
Greetings from Brazil.

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