Did you try restarting (turning off and back on) the tablet? Also, try turning off "Data", as sometimes that option can interfere with the "WiFi". Should neither of these work, then you may well have to have the tablet looked at.
Did you try restarting (turning off and back on) the tablet? Also, try turning off "Data", as sometimes that option can interfere with the "WiFi". Should neither of these work, then you may well have to have the tablet looked at.