Yellow triangle in taskbar network icon

i do that everyday when i go to sleep, i switch off router when i go to sleep and switch on it when i wake up, simply more than six ours my network disconnect everyday, and device manager is perfactly fine, this is not only for my laptop problem, because i connected my friends laptop through wifi, the yellow triangle appeared his laptop also, not only his laptop, every computer connect through my network shows yellow triangle which computers have windows seven os, thats why i considered about ip addressing and router configuration problem, my computer works great and no problem in my laptop...

any better idea friend....

Why would you disconnect your router every night? They typically run 24/7 without exception.

If the problem is occurring every 6 hours then try adjusting the DHCP lease time, they are usually set to 24 hours by default.

You must realize by now that this is a router problem.
 

My Computer

Computer type
PC/Desktop
Computer Manufacturer/Model Number
Home built
OS
Windows 7 Ult, Windows 8.1 Pro,
CPU
Q9650-4.275GHz, E8600 4.5GHz, E6750-3.8GHz
Motherboard
Evga 780i FTW
Memory
G.Skill PC2 9600 1200Mhz 5 5 5 15 2T
Graphics Card(s)
GTX480
Sound Card
Asus Xonar D2
Monitor(s) Displays
HannsG
Screen Resolution
1680X1050
Hard Drives
GSkill Phoenix Pro 120GB SSD
PSU
ThermalTake Toughpower 1000Watt modular
Case
ThermalTake XaserV
Cooling
Xigmatek S1283
Keyboard
Logitech G15
Mouse
Logitech G9
Internet Speed
T1
sorry for late reply,
my router model is zte zxv10 w300.
i don't think so it has DHCP lease time option...
 

My Computer

OS
Windows 7 Professional x64
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