Sprint hero pocket dialing

[phxdemon]

I have had my hero for a few months and love everything about the phone except it consistenly likes to pocket dial. First though was maybe the rom I was using is glitching but the issue has happened with 3 different roms. I always make sure to hit the end button and turn the screen off before placing it back in my pocket. Just wondering if anyone else has this issue and if there is maybe a good fix such as an alternative lock screen. Any input is appreciated