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Thanks for raising this to us @Tuanchauminh
We ran an initial test to the service it shows no dropout and stable for 1d 20h 19m.
In the event that you experience dropouts via Wireless/Wi-Fi connection, we recommend having a read on the following articles:
• Troubleshooting a Slow Internet Connection
• Easy Steps to Improve Wi-Fi Connection In Your Home
• Wireless Channel on your modem - what is it and why should I change it
Let us know how it will go.