Xperia m4 aqua wifi issues

Hi, Im new in the community
I'm having this issues with my xperia m4 aqua:

1. Phone finds wifi connections and appears to be connected with good signal but there is no internet (even at my home or work wifi)

2. Phone doesn't find any wifi connections, and if it does the network appears only as "saved" but cannot connect to it.

3. Phone doesn't respond to ON/OFF wifi switch, and the wifi symbol appears gray and with an exclamation mark.

4. The wifi connections appear when the...

Xperia m4 aqua wifi issues

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