Galaxy S5 burns data

My Galaxy S5 for some reason when traveling away from home is turning off the WiFi as my connection preference & is instead burning up data. This only happens away from my home Router/Network. I travel via City Bus into New Haven, CT the largest city nearby on a daily basis during the work week & for some reason as soon as I get away from my home the phone is turning off the WiFi & burning Data. It does NOT turn the WiFi back on, I have to do it manually & only noticed it when my prize of a...

Galaxy S5 burns data

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