I see this is an old thread, but I recently switched carriers to T-Mobile and wanted to keep my E5 play. It still runs Oreo and I never had a problem connecting to wifi for calls on my old plan with this phone until I switched over. I get the er04 dns error as well when I get home. I put the phone in airplane mode for a couple of seconds then turn it off and it connects right up to wifi.
how is your mobile connection when this is happening? how many bars of reception do you have when this is happening? Usually 4 or 5
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