I don't know what your problem is but I have had a MacBook Pro for almost a year now and it has never spontaneously shut down. I have clients who have both MBPs and MBs and not one of them has reported a spontaneous shut down.
On the other hand, since Ford had some Model Ts that suffered spontaneous shut downs, they haven't released a new model... but their engineers assure us that as soon as they figure out the Model T problems they will release the Model A...
The early MBPs had a problem where they would overheat the processor and shut down. This turned out to be the factory putting too much heatsink grease on the processor. It was quickly remedied, and I haven’t heard of a MBP doing that since.
I know..there are some out there that have suffered this random shutdown problem. When this started to happen to mine, I took it in,,they looked at it, reseated everything and the problem started getting worse..adding these panic kernels to boot. Then the techs tested the logic board ( mother board) and it was bad..without Apple care the computer of only 6 months would have to be used for parts as it would have been too costly to repair, I was told.
When this computer was in for repair I did google search on the problem and found sites were folks discussed and cusses this problem. Most of the entries were 2006 and my first laptop was built in 2006 and my new one is built 2007. I took it in the first time it did this and was told it had Bad RAM and they put in new RAM. Then the other day...it happened again so I am keeping a log on it. I do not leave the computer on for extended lengths of time..and never over night. For lots of the heavy lifting work I use my PC..yes I still have a windows PC..so I guess I am becoming bilingual !
If anyone else has had this random shutdown problem I’d appreciate a hollar about it and what you did to solve the issue.