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I did run remote tests on our end and there appears to be no fault on the line that can be service affecting. Your modem is currently detecting a sync speed of 19Mbps from the line which you can confirm when you log in to your modem's user interface.
When did you experience this issue? Was it while you're connected over Wi-Fi or it also happened via LAN connection?
You can also do ping and trace route tests then post the results here so we can determine any underlying issues.