[Q] 3G and Wifi reception issue after lollipop update - Galaxy S 4 Q&A, Help & Troubleshooting

they was working great. But after updating from Kitkat to lollipop I9505XXUHOB7 5.0.1
the 3g signal receiving is acting so weird. Videocall works smooth. Just i cant browse web smoothly. the download speed ups and downs making me angry. But 2g is also working fine. The issue is only with the 3G data.
Another is the wifi reception has also became decreased. No stable speed i get.
What u guys suggest?
I have flashed latest 0E4 modem and wifi fix but no improve. What u suggest?

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Thank you before hand
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