Constant Forced Shut-downs due to some sort of kernel panic...

Hi there, I'm currently running OS 10.4.10 and over the past month or so I have been having some serious issues with my macbook making me force shut-down. Most of the time it ocures when i leave my computer for a few minutes. I come back to a screen that is locked up, displaying a message in multiple languages telling me to hold the power button to force shut-down and restart. I called applecare and they told me my phone support was over, however the person I talked to stated that it was a kernel panic. I've searched many things but nothing has really helped. I've tried disk utility, I've tried re-installing 10.4.10 but I still have the issue. Does anyone know what the heck is going on??
This is a copy of the log from the kernel panic:
Mon Sep 10 14:20:55 2007
panic(cpu 1 caller 0x003BEE20): OSObject::refcount: Attempting to retain a freed object
Backtrace, Format - Frame : Return Address (4 potential args on stack)
0x151abbb8 : 0x128d08 (0x3cc0a4 0x151abbdc 0x131de5 0x0)
0x151abbf8 : 0x3bee20 (0x3f262c 0x3f2608 0x3915584 0x3914980)
0x151abc18 : 0x3c1cab (0x37a0e60 0x4b0958 0x38 0x3c1934)
0x151abc48 : 0x3c1e04 (0x37b3640 0x3914980 0x0 0x3c205f)
0x151abc68 : 0x3c27fa (0x3914980 0x0 0x0 0x0)
0x151abca8 : 0x3c2867 (0x3914980 0x3c22980 0x37b35c0 0x1628d8)
0x151abce8 : 0x38759c (0x38ff880 0x0 0x151abd28 0x3c1f72)
0x151abd08 : 0x38adbb (0x38fc600 0x3c1c840 0x0 0x38fc600)
0x151abd28 : 0x3b23a8 (0x38fc600 0x3c1c840 0x151abd58 0x3bef49)
0x151abd78 : 0x188511 (0x38fc600 0x3d8a6b4 0x3d8a6c8 0x11cc32)
0x151abdb8 : 0x12b4c3 (0x4a6ceb4 0x3d8a698 0x0 0x0)
0x151abdf8 : 0x124b17 (0x4a6ce00 0x0 0x18 0x151abedc)
0x151abf08 : 0x195a42 (0x151abf44 0x0 0x0 0x0)
0x151abfc8 : 0x19b32e (0x3d1c820 0x0 0x19e0b5 0x3d1c820) No mapping exists for frame pointer
Backtrace terminated-invalid frame pointer 0xb011e448
Kernel version:
Darwin Kernel Version 8.10.1: Wed May 23 16:33:00 PDT 2007; root:xnu-792.22.5~1/RELEASE_I386

Hi--
Do any of your panic logs have anything in the backtrace section? If so, that would be most helpful to see. Also, do you have any third party drivers installed, like a driver for a mouse or some Firewire or USB peripheral, like an audio interface?
How much RAM do you have? And how many chips? You might have a bad RAM chip that's causing the panics. If you have two chips, try removing one and see if the panics go away. If not, replace it and remove the other chip.
This page has detailed instructions on how to track down a kernel panic. Perhaps it'll help you, but be sure to read it carefully.
charlie

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