[Q] HELP WITH HTC Surround

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hello everyone i have a HTC Surround (AT&T) after some monts i got update fom zune from 7.0 to 7.5 Mango and begins trouble with sensor i need to try 20 times to unlocking device in more cases touch not working normally i need to pres some hard buton after touch begin working .... i re flash all discernible ROM for this device but problem not resolve just in version 1.03 is less bad but not resolves totally ................
?????????????????????? who can help to resolve this trouble or maybe to re flash a original ROM from AT&t but where download any ideas