Touch screen! Help please

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http://forum.xda-developers.com – I have problem with touch screen, when it is in direct sunlight or any strong light, it becomes unresponsive for 1or 2 minutes. This happens when I lock, so it means in lock screen I can not touch anything its not responding for few minutes. And what is most important, this problem is since I updated to ICS,in 4.0.3 and 4.0.4 also. But if I flash back to GB 2.3.6 I dont have this problem and it works perfect. And I heard a lot people having this problem, did some one found solution, as it is working in GB so it is not hardware problem. I am really thankfully if anyone can help me. (HowTos)