There's a new error which is making me unable to join servers

There's a bug... That even if I did turn on [use data usage]    the error keeps popping out saying.. You should be connected to WiFi... Pls fix this problem. I really need to join server.... Plus I don't have any wifi

 

After the update the performance has degraded with lag

Especially when your playing multiplayers

 

Pls fix it before some esle does