Please tell us some basic information before asking for help:
Model Name: ROG 5S
Rooted or not:
Frequency of Occurrence:
APP Name & APP Version (If your issue relates to the app):
In addition to information above, please also provide as much details as you can, e.g., using scenario, what troubleshooting you've already done, screenshot, etc.
Yesterday fine connection Internet WiFi.
I checked today to My brother Xiaomi run all apps is fine WiFi.
Let see video, what happened. https://youtu.be/gn9ibUafOXM