Why is my phone external application not working with data but working with wifi

[Android Central Question]

Whenever I tried browsing with my data, it won't work, it will only say network connection error... It happens on my external app like Instagram, WhatsApp, vidmate, operamini

 

[ManiacJoe]

I see that very infrequently on my LG V30.
Restarting the phone seems to solve the problem.