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Did you update to marshmallow? Change your IPv6 in the APN to IPv4/6. Seems Samsung messed up the IPv6 code on a lot of their devices.
^^^ Changing this setting is a good idea. I suggest clearing the cache and history from the phone then giving it a restart before you retest it.
I think your problem isn't priority is capacity issues seems like there a lot of users in the area your two options might be either call corporate and ask for the tower on your area too be upgraded or switch too 4G until congestion is cleared out