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Hi @Vinhdang
Welcome to the Community!
Thanks for raising this with us. Using your community details, I was able to pull up your account and check your connection status.
Based on diagnostic tests I have performed, I can say that we're not detecting any line fault that will affection your connection. In addition, your modem has been connected to our server for 18 hours. For the past week, I'm only seeing 3 dropouts wherein 2 of which is on the 25th and 1 dropout for the 26th. However, if you performed any reboots during those days, that could be the reason for those dropouts I have found.
In order to find out what's really causing the issue you're having, can you provide us the following details:
We look forward to your response.
Regards,