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
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.
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