It happened a few times a few days before but It usually work after restarting the raspberry pi but now it wont even let me open my dashboard and crash both the node red and the dashboard page
In future please, when posting log output, please copy/paste the text rather than screenshot.
The warning in the log is just a warning not an error, and has not crashed node red, in fact right at the bottom of the screenshot you can see that it has successfully connected. Please post the full log from the welcome message to when it stabilises.
If you run the command top in a command window on the pi does it show that anything is using lots of CPU or memory?
Are you running the browser on the pi? If so, what do you see if you run the browser on a PC using the ip address of the pi?