WiFi connection sketchy

Seems a system update causes my WiFi connection to fluctuate. I have tried everything, even getting a replacement phone. I have also had my Internet provider send 4 techs out to see if they could correct the problem. Restarting phone, and all other technical suggestions have not worked. This happens when I am sitting next to my router! I read a post by an iPhone user that outlines everything I have tried, and am now trying the further suggestions of Verizon in their reply to that user. Hoping something will work, but why do an update that breaks things? Really stupid.

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Re: WiFi connection sketchy
Customer Service Rep

Having a good working device is important, and we are here to ensure that is the case. Are any other devices having the same issues in your home? AlbertP_VZW