Please tell us some basic information before asking for help:
Model Name: ASUS_Z01RD
Firmware Version: WW_18.104.22.168_20200520
Rooted or not: na
Frequency of Occurrence: network is ON and OFF every 2 seconds, phone restarting AGAIN and AGAIN after few minutes.
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.