Wifi and bluetooth are 2 different radio/wireless communication tools. Where wifi is a wide area network bluetooth is a personal area network. Short range of about 30 ft.
Bluetooth in a laptop is most commonly used to wirelessly attach to mice, printers or slide projectors for...
Cooked chicken should be good for 3-4 days if kept in the fridge.
I wouldn't worry about warming it multiple times. In fact its probably better to warm it.
You kill some bacteria when its cooked/heated again.