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Wifi disconnection

Hello,

I’m having trouble with wifi connections. My FP2 keeps on disconnecting. Mostly when I’m home connected to my network.
It keeps disconnecting sometimes in and out. I’m texting on whatsapp and message goes throught after 2 to 3 mn sometimes more.
I’m receiving messages after 10 to 15 minutes also. It’s making almost impossible to have a conversation. With video and calls as well. In 2mn it disconnect 3 to 4 times.

I’m using apk pure and fdroid and I deleted a lot of my apps 3 weeks ago.

Any solutions?
Thanks