You WhatsApp stopped working???
Let's figure this out...
First of all, check if your telephone connected to internet or Wi-Fi
Restart your computer, enter the app and try to scan QR code again
Also if you clear cookies and cash, open your store in incognito page - it will surely help
In your browser check that you have ONLY one tab with WhatsApp opened!
If you still can't connect to WhatsApp, please contact us via our support chat