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Hi @mahdirajadi
Welcome to the Community!
We were able to locate your account using your community details and tested the line, but was not able to detect any fault.
The modem/router is getting a good connection speed as well.
Are you using the 2.4GHz or 5GHz band network? Have you tried testing the speed via Wired?
What troubleshooting have you done so far?
BasilDV