Thank you for your asking.
Have you already tried the suggestion me and other users posted? If you did, kindly provide me the information below so that I could better assist you.
1. Your Model Name: Settings>System>About phone
Refer to the link below to check the model name by model no. in the linkhttps://www.asus.com/support/FAQ/1014441/
2. Your current firmware version
Settings>System>About Phone>Software information
If you try to update to the latest version, does the issue still remain?
3. Safe Mode result
4. Factory Reset result
5. Try clean your port and change other cable
If you have any further queries, please do not hesitate to contact me.