Wifi tethering blinks to ON/OFF mode while connecting the device to data Wifi tethering shows an error while activating data on my android device. What may be the cause? Please reply. 
Thanks in advance.

I am using Xiaomi phone, First of all I will switch on the tethering function on phone, and connect it to laptop. After that, I will connect the phone with internet. Then it shows the wifi tethering icon,and after some seconds it will goes to hidden state(turns-off tethering), again shows and hides, until data is off.
'Android System' system application which controls tethering feature if android phones. I had provided restriction to it unexpectedly. And enabling it for data usage, solved the problem.