Macbook keeps re-booting HELP!

[vslayer100]

Hi !

I'm running 10.6.8 on an older macbook (maybe 2007 version). About two weeks ago it restarted for no reason. One week later this occurred again and since then has become a more and more frequent occurrence.

I can almost guarantee it will re-boot if I do one of the following:
- open to many applications or internet browsers
- plug something into the usb port after it's been on for awhile
- unplug my power adapter (even though battery is at 100%).

I've tried a few things such as holding down OPTION+APPLE+P+R when restarting. I've also reset the SMC. And I removed spotlight function.

Some days the macbook will stay on all day and be fine. Others, I can't even open up an internet browser. Yesterday I worked on it for approx 8 hours in a row, left for 2 hours and when I took it off sleep mode it immediately re-booted on me. I purchased extra RAM years ago so it shouldn't be lack of processing power.

Below is also the most recent CONSOLE report. here: http://pastebin.com/D5udyp8J

My console report is about 50 pages long from the last day so I've only included the most recent stuff.
Any help is greatly appreciated. Thanks.

 

[MCAsan]

Have you tried PRAM and SMC resets? Have your tried to restore from latest backup or a backup from just before the problem started?

What does the Hardware Overview say in System Report?

Example
Hardware Overview:

Model Name: MacBook Pro
Model Identifier: MacBookPro11,3
Processor Name: Intel Core i7
Processor Speed: 2.6 GHz
Number of Processors: 1
Total Number of Cores: 4
L2 Cache (per Core): 256 KB
L3 Cache: 6 MB
Memory: 16 GB
Boot ROM Version: MBP112.0138.B08
SMC Version (system): 2.19f11
Serial Number (system): C02N2138FD59
Hardware UUID: 91EAFE75-8869-56B6-8240-B5832CD5D9F0

 

[vslayer100]

I tried them both.. and really don't want to restore from last backup because it was a while ago.

Here is the info:

Model Name: MacBook
Model Identifier: MacBook2,1
Processor Name: Intel Core 2 Duo
Processor Speed: 2.16 GHz
Number Of Processors: 1
Total Number Of Cores: 2
L2 Cache: 4 MB
Memory: 2 GB
Bus Speed: 667 MHz
Boot ROM Version: MB21.00A5.B07
SMC Version (system): 1.17f0
Serial Number (system): W872636PYA6
Hardware UUID: 00000000-0000-1000-8000-0019E33F3DCA
Sudden Motion Sensor:
State: Enabled