i cannot use my wifi

hello,

I am using ipod5 ios7

it worked before well.

but i am facing a problem in wifi.

it gets connected to wifi easily and i can open up google, i can even search up things,

but when i try to open the searched result it shows me page cannot be displayed.

then all i have to do is switch off wifi and switch it on again and then it opens up.

sometimes half of the searched results (frm google) opens up and some donot.

i even face the same problem on other apps like instagram which shows "could not refresh feed"

What i have tried (dont tell me to do this again)

1. reset the network settings

2.reset all settings

3.switch on and off ipod

4.updated the firmware of router

5.restore the ipod to previous backup

Other devices connect to wifi properly. that is my mobile 😟

please help me. it was working well before. only after the warranty ended few days back it is showing problems.