I am running build 7057 on a Compaq Presario c571NR. I just upgraded to build 7057 and I have noted that my laptop will go into sleep mode even though there is adequate remaining battery life and the power management settings are set to never go to sleep (I did this last bit to try and diagnose my problem). In the last 3 1/2hours of running on battery this has happened three times. I am able to turn the computer back on and it resumes appropriately from the suspended session.

I got some bad news for you... Build 7057 is NOT an officially released build. The only officially released build is 7000and as such, it is the ONLY build officially supported in these forums. When the offical Release Candidate is released, that build will also be supported. Build 7057 is an internal interim build that was meant to test various features and as such it's NOT meant for public consumption. Even so, someone released it - even though he/she was NOT supposed to do so. The official response can be read here.