Post-Firmware Update Problems--HELP

Several weeks ago I downloaded the Firmware update for my MBP. My MBP had an intermittent history of going to sleep and not waking up. When I ran the update, my MBP crashed and would not reboot. I had to obtain a copy of an original firmware disk from my local Apple dealer and load that in order to get my computer to operate.

Thereafter, using "original" firmware, my MBP had a regular problem with unexpected shut downs. I just got around to re-downloading and installing the recommended firmware update, and I am experiencing the unexpected quits again! Quits occur without regard to battery charge level. Since the update the quits happen within a couple of minutes of use. Before update the quits would happen later than the first couple of minutes of use. These unexpected quits are tethering me to an outlet and making me crazy.

1. Was the firmware update suppose to correct my original problem (not waking from sleep occassionally)?

2. Was the firmware update suppose to correct my new problem (unexpected quits)? If so, why didn't it?

3. Is it possible that the crash several weeks ago caused another software problem that is causing confusion regarding power availability?