Home button not reacting when device is locked

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http://forum.xda-developers.com – Dear all, I bought my wife a Galaxy y from t-mobile. I noticed when I locked the device via the button on the right and put the device in standby, I cannot wake up the phone by pressing the home button and get the screen to unlock the device by wiping. Only when I press the home button fot long time and sometimes twice for a long time, I manage to get the unlock screen. Very annoying. And when I do this, the sd card has to be remounted every time. Does anyone have had similar issues? Phone is on GB2.3.5 with LA2 rom if i'm correct. LH2 is the new release. There's a software update avai (HowTos)