there is a prohibit signal at the top right corner in my tab

[AC Question]

there is a prohibit signal at the top right corner in my tab from so many days.
as a result my tab is hanging so much i cant use my tab.what shall i do

 

[Javier P]

Do you mean the icon in my screenshot? If so it means that you've set notifications to "none". To change it tap on the Volume button and select "all".