Cannot turn on WiFi and Bluetooth on Samsung Galaxy Tab 4

I have Samsung Galaxy Tab 4 running on Android 4.4.2. I just bought it 3 months ago. It's not rooted (I don't want root it). I also have "Terminal Emulator" (downloaded from Play Store). I can't turn on WiFi and Bluetooth. MAC address and Bluetooth address also don't show up on settings. When I press the WiFi button (on the quick settings), it turns green for 3-6 seconds, then it turns back to white again (same as Bluetooth button). Could someone point me what's the cause and how to fix it?