Windows 7: Yellow Triangle keep appears

Windows 7 ultimate x64

I'm having this issue from a long time, i got this yellow triangle from time to time, but recently it occurs like more than 5 times a day!!
once i got the yellow triangle i have to restart both my pc and router, otherwise my connection will not get back normally.
I'm using Kaspersky Internet Security 2013, and my network is added to trusted network, even when i disable firewall i still have the problem.
I formatted my pc 3 times already, nothing have changed since then.

help me with this issues, its like a nightmare.

A yellow triangle where, exactly, that info would help. Post a snip of it.
Like this, not a file or other host. Screenshots and Files - Upload and Post in Seven Forums

where else could be

network connection icon

Device manager, action center, many places.