Win 7 PC schaltet sporadisch mit Bluescreen ab

Hallo,
mein PC schaltet seit einiger Zeit sporadisch ab und es kommt ein Bluescreen für einige Sekunden bis er dann wieder neu bootet. Ich habe eine Analyse mit Who Crashed gemacht

System Information (local)
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computer name: ADMIN-PC
windows version: Windows 7 Service Pack 1, 6.1, build: 7601
windows dir: C:\Windows
Hardware: Gigabyte Technology Co., Ltd., A88XM-DS2
CPU: AuthenticAMD AMD A8-6600K APU with Radeon(tm) HD Graphics AMD586, level: 21
4 logical processors, active mask: 15
RAM: 6381056000 total


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Crash Dump Analysis
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Crash dump directory: C:\Windows\Minidump

Crash dumps are enabled on your computer.

On Tue 19.05.2015 08:54:12 GMT your computer crashed
crash dump file: C:\Windows\Minidump\051915-17721-01.dmp
This was probably caused by the following module: atikmpag.sys (atikmpag+0xAE5C)
Bugcheck code: 0x116 (0xFFFFFA80070CD010, 0xFFFFF8800443CE5C, 0x0, 0x2)
Error: VIDEO_TDR_ERROR
file path: C:\Windows\system32\drivers\atikmpag.sys
product: AMD driver
company: Advanced Micro Devices, Inc.
description: AMD multi-vendor Miniport Driver
Bug check description: This indicates that an attempt to reset the display driver and recover from a timeout failed.
A third party driver was identified as the probable root cause of this system error. It is suggested you look for an update for the following driver: atikmpag.sys (AMD multi-vendor Miniport Driver, Advanced Micro Devices, Inc.).
Google query: Advanced Micro Devices, Inc. VIDEO_TDR_ERROR



On Tue 19.05.2015 08:54:12 GMT your computer crashed
crash dump file: C:\Windows\memory.dmp
This was probably caused by the following module: atikmpag.sys (0xFFFFF8800443CE5C)
Bugcheck code: 0x116 (0xFFFFFA80070CD010, 0xFFFFF8800443CE5C, 0x0, 0x2)
Error: VIDEO_TDR_ERROR
file path: C:\Windows\system32\drivers\atikmpag.sys
product: AMD driver
company: Advanced Micro Devices, Inc.
description: AMD multi-vendor Miniport Driver
Bug check description: This indicates that an attempt to reset the display driver and recover from a timeout failed.
A third party driver was identified as the probable root cause of this system error. It is suggested you look for an update for the following driver: atikmpag.sys (AMD multi-vendor Miniport Driver, Advanced Micro Devices, Inc.).
Google query: Advanced Micro Devices, Inc. VIDEO_TDR_ERROR