Hi, Takuya.
After investigating the cause, it appears that the problem occurs when the Norton Secure VPN feature is turned on.
I did not need this feature, so I turned it off and solved the problem.
Thanks for checking 
Hi, Takuya.
After investigating the cause, it appears that the problem occurs when the Norton Secure VPN feature is turned on.
I did not need this feature, so I turned it off and solved the problem.
Thanks for checking