Wi-fi Does Not Work With Call

[paulodarocharuivo]

Hello, I have a redmi note 4x, with ROM miui 9 7.8.24 and when I have to make a call all the applications that are working in the background are disabled, ie the Waze app loses the GPS signal and I get the Internet signal off. thank you

 

[susilo]

My wifi sometimes turns itself off. What is a bug?