macbook randomly shutting down with leopard

[blahbrah]

Hey, for the past 3 days my macbook (c2d pre-santa rosa) has been randomly shutting down after being left on overnight. It has never been a problem before. Here is the error report:
Tue Jan 8 07:39:05 2008
panic(cpu 1 caller 0x0039CD77): "m_free: freeing an already freed mbuf"@/SourceCache/xnu/xnu-1228.0.2/bsd/kern/uipc_mbuf.c:2742
Backtrace, Format - Frame : Return Address (4 potential args on stack)
0x284b32e8 : 0x12b0e1 (0x455670 0x284b331c 0x133238 0x0)
0x284b3338 : 0x39cd77 (0x48e03c 0x3021c800 0x484f601c 0x1432a6)
0x284b3378 : 0x39d073 (0x301d0b00 0x8 0x284b33c8 0x1)
0x284b3398 : 0x9f6b87 (0x30246b00 0x0 0x20 0x12fa3a)
0x284b3508 : 0x9f6ec5 (0x23c372c8 0x23c39150 0x284b3518 0x284b3518)
0x284b3658 : 0xa00fe9 (0x23c3a004 0x0 0x284b3668 0x19ccc1)
0x284b36b8 : 0xa02e9e (0x23c374c0 0xc0a00171 0x1ed92 0x284b36c8)
0x284b3838 : 0x9e887d (0x23c374c0 0x2 0xc0 0xbb3c78)
0x284b39d8 : 0xa031c6 (0x23c374c0 0x300d7f00 0x484f6004 0xc0)
0x284b3b28 : 0x9e3d24 (0x23c374c0 0x300d7f00 0x484f6004 0xc0)
0x284b3c08 : 0xa045bb (0x484f6004 0x300d7f00 0x38 0x94e5e597)
0x284b3de8 : 0xa05fb1 (0x23c372c8 0x38a72d 0x4 0x127206)
0x284b3f18 : 0x41d149 (0x23c37000 0x425cc80 0x1 0x19ccc1)
0x284b3f68 : 0x41c2a6 (0x425cc80 0xaf850a4 0x284b3fc8 0x3da847)
0x284b3f98 : 0x41bf88 (0x3d87f00 0x503058 0x3f7d2e0 0x1)
0x284b3fc8 : 0x19e2ec (0x3d87f00 0x0 0x10 0x4324e20)
Backtrace terminated-invalid frame pointer 0
Kernel loadable modules in backtrace (with dependencies):
com.apple.driver.AirPort.Atheros(300.22)@0x9d1000->0xa5bfff
dependency: com.apple.iokit.IO80211Family(200.7)@0x9b3000
dependency: com.apple.iokit.IOPCIFamily(2.4)@0x6ab000
dependency: com.apple.iokit.IONetworkingFamily(1.6.0)@0x6bb000

BSD process name corresponding to current thread: kernel_task

Mac OS version:
9B18

Kernel version:
Darwin Kernel Version 9.1.0: Wed Oct 31 17:46:22 PDT 2007; root:xnu-1228.0.2~1/RELEASE_I386
System model name: MacBook2,1 (Mac-F4208CA9)

[Neuro]

Hi, my other half's MacBook Pro (pre Santa Rosa) had the same problem, although it was slightly more random, often when not under load at all.

The Apple Store replaced the logic board which didn't help, but then replaced the thermal sensors. That fixed it.

[MoeOz]

Same happening now with my 3 month's MBP C2D 2.2 !! what's the thermal sensors ?? God im far away from the US and there isn't any apple store here !!

Edit : oh something related to the temperature hmm .. but thats never happened with the Tiger , mayb something bout leopard ? , any software update mite help ? , i need someone expert to tell me so .. so annoying :s

[blahbrah]

thanks guys, how long did it take to replace the sensors?

Also it just happened while I was using it, the screen turned gray and a sign just said I had to restart. Airport speakers stopped before this happened.