Perhaps you led me to the issue. Time will tell. I checked one of the offending Fire's and it had a feature called "Smart Suspend" which turns off the WiFi when you are not using the device. I turned that off and will see if that makes a difference. It was either turned on by a Fire update or it has been on all along and is not the issue. It certainly acts like it is losing WiFi and when I press the refresh button it "wakes up" and reconnects. Make sense. I will report back once I have an indication.
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