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@iamax10user,
Thanks for the inquiry.
Have you attempted to backup and factory reset the phone?
Normally if you've not uninstalled other apps that can control the functions of the phone, I would advise to check the various apps you have installed. Also, like you've already done, disabling all Smart Connect functions will also help as various conditions can do this as well... like connecting the power cord, etc. Also, check Settings > Power Management > Location Based Wifi and other settings. See if any of these can be casuing your difficulty.
Let us know.
My tablet Z (wifi only) has the same problem. It started after I installed lollipop 5.1.1.