Mid 2010 MB Pro - Repeatedly restarts

Please help. It didn't happen from new, untill 6 months ago.

Processor 2.66 GHz Intel Core i7

Memory 8 GB 1067 MHz DDR3

Graphics NVIDIA GeForce GT 330M 512 MB

Software OS X 10.8.5 (12F45)

Interval Since Last Panic Report: 8883 sec

Panics Since Last Report: 7

Anonymous UUID: 7F85F19B-DFB6-696F-296B-A926BBC8CAF8

Wed Oct 16 16:38:29 2013

panic(cpu 0 caller 0xffffff7f96c7df1a): "GPU Panic: [<None>] 3 3 7f 0 0 0 0 3 : NVRM[0/1:0:0]: Read Error 0x00000100: CFG 0xffffffff 0xffffffff 0xffffffff, BAR0 0xd2000000 0xffffff810585c000 0x0a5480a2, D0, P2/4\n"@/SourceCache/AppleGraphicsControl/AppleGraphicsControl-3.4.5/src/AppleM uxControl/kext/GPUPanic.cpp:127

Backtrace (CPU 0), Frame : Return Address

0xffffff80fcfaaef0 : 0xffffff8014a1d636

0xffffff80fcfaaf60 : 0xffffff7f96c7df1a

0xffffff80fcfab030 : 0xffffff7f9517026c

0xffffff80fcfab0f0 : 0xffffff7f952431f6

0xffffff80fcfab130 : 0xffffff7f95243254

0xffffff80fcfab1a0 : 0xffffff7f95508278

0xffffff80fcfab2d0 : 0xffffff7f9526bad1

0xffffff80fcfab2f0 : 0xffffff7f9517703f

0xffffff80fcfab3a0 : 0xffffff7f95174ad6

0xffffff80fcfab5a0 : 0xffffff7f951763ff

0xffffff80fcfab670 : 0xffffff7f9619a93e

0xffffff80fcfab730 : 0xffffff7f961c6028

0xffffff80fcfab7b0 : 0xffffff7f961ad460

0xffffff80fcfab810 : 0xffffff7f961add41

0xffffff80fcfab860 : 0xffffff7f961ae1f3

0xffffff80fcfab8d0 : 0xffffff7f961aea53

0xffffff80fcfab910 : 0xffffff7f96179edf

0xffffff80fcfaba90 : 0xffffff7f961aaf8f

0xffffff80fcfabb50 : 0xffffff7f96178978

0xffffff80fcfabba0 : 0xffffff8014e6f789

0xffffff80fcfabbc0 : 0xffffff8014e70d30

0xffffff80fcfabc20 : 0xffffff8014e6e74f

0xffffff80fcfabd70 : 0xffffff8014a98c21

0xffffff80fcfabe80 : 0xffffff8014a20b4d

0xffffff80fcfabeb0 : 0xffffff8014a10448

0xffffff80fcfabf00 : 0xffffff8014a1961b

0xffffff80fcfabf70 : 0xffffff8014aa6546

0xffffff80fcfabfb0 : 0xffffff8014acf473

Kernel Extensions in backtrace:

com.apple.driver.AppleMuxControl(3.4.5)[49FEF732-D7A3-327B-A7AA-6AC5A6E3DCFF]@0 xffffff7f96c70000->0xffffff7f96c82fff

dependency: com.apple.driver.AppleBacklightExpert(1.0.4)[B5B1F368-132E-3509-9ED5-93270E3ABB DD]@0xffffff7f96c6b000

dependency: com.apple.iokit.IOPCIFamily(2.8)[6C1D646D-7E5E-3D7F-A557-2CBA398FF878]@0xffffff 7f95075000

dependency: com.apple.driver.AppleGraphicsControl(3.4.5)[4A2C8548-7EF1-38A9-8817-E8CB34B8DC A6]@0xffffff7f96c57000

dependency: com.apple.iokit.IOACPIFamily(1.4)[A35915E8-C1B0-3C0F-81DF-5515BC9002FC]@0xfffff f7f94ff3000

dependency: com.apple.iokit.IONDRVSupport(2.3.7)[F16E015E-1ABE-3C40-AC71-BC54F4BE442E]@0xff ffff7f950fb000

dependency: com.apple.iokit.IOGraphicsFamily(2.3.7)[9928306E-3508-3DBC-80A4-D8F1D87650D7]@0 xffffff7f950b8000

com.apple.NVDAResman(8.1.6)[EA4F9902-5AAE-3F1D-A846-3796221C8C91]@0xffffff7f951 0f000->0xffffff7f953b1fff

dependency: com.apple.iokit.IOPCIFamily(2.8)[6C1D646D-7E5E-3D7F-A557-2CBA398FF878]@0xffffff 7f95075000

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