Please tell us some basic information before asking for help:
Model Name: ASUS ROG Phone 5
Firmware Version: 31.0810.1226.114
Rooted or not: NO
Frequency of Occurrence: ALL THE TIME
APP Name & APP Version (If your issue relates to the app): WI-FI
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.
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My phone suddenly can't turn on wi-fi service, even after rebooting, what should I do?