First, please check whether your service traffic has been exhausted.
If you have not exhausted your traffic, please check that the time/time zone is set correctly, and the discrepancy must be less than 90 seconds.
In the meantime, Please update your subscription node list by clicking on the blue button on the PC client.
For mobile users, if on Android, please press 'Update subscription' or re-login.
As for iOS users, please go to [settings] -- [Force Refresh Server List] -- [Do it], or simply log out and log in again.
