Yes, it does. I'll take my dings for not being able to provide links, but it seems to me a few years ago OCZ was being soundly criticized for using substandard parts that might not hold up; things like 85C [Samxon] capacitors if I remember correctly.
If it is capacitor problems because of heat, output filtering could be suffering. It may be passing out-of-spec ripple that is triggering the restarts, at least until it cools back down. This is potentially dangerous to attached parts.
I would suggest running on only one graphics card until you've replaced that PSU.
Could i locate the problem in PSU, i know PSUs does have some kind of diagnosis message thru some specific pins. But it probably won't tell exact problem. But lets suppose i know what is the problem it should be chageable isn't it?
No. Working inside a PSU is extremely hazardous unless you know exactly what you are doing. Capacitors can be replaced (I know at least two technical PSU reviewers who do it), but it's a good way to get burned or killed if you are not extremely careful. There is no detailed diagnostic information provided by a PSU, just a "power good" signal that is of limited value (but may be dropping, causing your mobo to shut off).
Capacitors in a PSU can be replaced. If you know what you are doing, such as how to discharge them first, you can do it. Companies like mouser.com can source any parts you're likely to need. If you go to the badcaps.org forums, you will find companies selling "recap" kits, although those are typically for motherboards.
Just keep in mind there's no guarantee this will repair this unit. It may save a lot of time and trouble to just replace it.