Unlock slider problem! HELP!

[#1]

Hi everyone!

Help needed in such an issue: I can't unlock my phone with unlock slider right after pressing power button. It needs at least 3 tries after which I can unlock it. After that sensor works fine until next phone lock. The same thing happens while answering a call.

The same problem was noticed at different NEO phones with different firmwares and kernels installed (with both locked and unlocked bootloaders), and was discussed at 4pda.ru, but nobody knows the answer. Sometimes rollback at older firmware versions solved that issue, but commonly it didn't.

Please give me some qualified advice!

P.s. There are no protective covers or cases

Pic.1 Sliding from left screen border to the right just after waking up the phone. As you see, first three tries was unsuccessful, the second three was ok.

Pic.2 Sliding from left screen border to the right after reopening the touch screen test. Everything is ok.

[Johan]

What is the software condition of your phone? What build number are you running on? Unlocked boot loader?

[#3]

What do you mean under "condition"? Phone worked with both 4.0.4 and 2.3.4 versions of Android, bootloader officially unlocked, root granted. But i know another phone with the same problem, and it's bootloader is locked. Now i have Android 4.0.2.A.0.62 (1242-4466), customization version 1246-9107, SI: 1247-1300 and custom version of kernel flashed. But my problem persists even on stock kernel+firmware, both Gingerbread and ICS