Sometimes Gmail stops loading and it makes us so frustrated but if you are facing this issue then you just have to follow some simple steps which are given below and you can solve your problem:-
You can switch between the browsers
Check if you dont have any extension which is effecting your Gmail
Make sure you are not using any VPN
http://get-assist-net.liberty.me/how-to-fix-gmail-not-loading-issue/
https://educatorpages.com/site/getassist/pages/why-my-gmail-is-not-loading?