First thing to try, in the members app in the support tab, go to diagnostics, go straight to Wifi and test it. If there is failure, call Samsung support.
Next try this, go to settings, apps, where you see it say your apps, there will be 3 lines with an arrow pointing down, tap on that, turn on show system apps, type in Bluetooth, tap to open, go to storage and clear cache.
If that doesn't work, try a wipe cache partition.
If that doesn't work, go to Rest settings and Reset Wifi and Bluetooth Settings.
