Why is my wifi on S4 I9500 gets delay when i turn it on?

Hi,
I have problem on my I9500 S4. When I turn the wifi on, it gets grey for 20-30 seconds then it gets green (ON). I always face this since my upgrade from Kitkat to lollipop. Also, I get setting not responding.
I tried factory reset
wipe cash
both didnt work and same problem. I use Russian Firmware.

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