I have already looked into the issue here but the problem was with Raspberry PI Zero and it not able to connect to the NTP. Which shouldn't be a problem for me because I have an ethernet connection and when refreshing the page the device doesn't shut down.
Please see this post for how to post your flow so that it is easy for use to copy/import it - How to share code or flow json
Also tell us which version of node-red, node-red-dashboard and nodejs you are using. You can get the node versions from Manage Palette, and the command node -v will tell us the node version. Also what browser/OS are you using?