z68XP-UD7-B3 : Time to return the mobo or not ?

[Saldo]

Hello team,

Last year in october you helped my setting up my pc with a max oc at 4.8 Ghz.
This oc I only used with Flightsimulator.
It did run perfectly till februari this year.

The bootloop issue I was able to solve by turning on the power , but not bootup the pc.
After 10-15 minutes the pc would bootup perfectly.

As I only played Fs once a month, I made a second profile at 3.8 Ghz ( turbo at 3.8 )  so the pc would be stressed less.

This worked fine till februari this year.
I could bootup the pc in this way immediately after I turned on the power.

In februari I got the bootloop issue again and solved it by clocking back to 3.6 with turbo set to 3.6.

Last week the bootloop issue began again.
The pc gave the message that the oc was not succesfull and clocked back the memory from 2133 to 1600.
At 1600 mhz memory the pc worked fine.

Since 2 days the isses are back and I clocked back to 3.4 with turbo set to 3.4.
When turning on the power and leaving the pc for 10 minutes it will boot with memory set to 2133.
When turning on the power and booting immediatly The oc message returns and the pc clocks back the memory to 1600 mhz.

Today I tried to run flightsimualtor .
Anything higher than 3.6 will not boot up, so I trie with 3.6
It started fine, but in scenery with lots of mesh ( mountains)  I am getting appcrash  errrors, which point to hardware.

Already I contacted to the store where I almost bought everything and they advised me to return the mobo.

Is there anything I could try before doing this, because I will be without a working pc for up to 6 weeks ?

Thanks in advance,
Gerard    

Nb
In march this year I upgraded the bios from F9c to F10 and have not seen any weird things.

 
Hardware :
I7-2600K @ 4.8 Ghz Fs / 3.6 daily
z68XP-UD7   latest Bios : F10
8Gb G.Skill Ripjaws 2133 mhz with fanmodule running at Expert/Extreme setting Timings in Fs / auto daily
Gigabyte GTX580 SO running @ 905 mzh
OCZ 1000W psu
1x  OCZ   60 Gb SSD sata 3
3x  OCZ 120 Gb SSD sata 3
Thermaltake Kandalf case with factory built in liquid cooling system

Windows 7 Ultimate 64 bit

[Dark Mantis]

Hi.

I would advise checking the memory as the first option. It is a fairly time intensive operation but worth doing properly. Use the following instructions and follow them exactly!

Make sure that you use the very latest version of the program.

Memtest86+        http://www.memtest.org/

Insert one stick of memory in slot 1 and run Memtest on it for at least 10 complete loops/cycles and if there are no errors then swap it over with the next one and continue untill you have checked all  modules.
 
If you have any errors the module is faulty.

If you have any faulty modules you will have to return the whole kit as they are matched.

Post back when you have done that with the results.