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Intermittent internet when phone rings (not EVERY time, but most of the time) -FAULTY modem??

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Intermittent internet when phone rings (not EVERY time, but most of the time) -FAULTY modem??

 We have been experiencing intermittent internet problems when we receive an incoming call. This doesn't happen EVERY time, but most every time. The phone will ring, the whole modem shuts down and then begins the reboot process. I have spoke with a representative in regards to this and was told our internet was 'working fine'. It ONLY does this when the phone rings and always boots back up. I've researched this and perhaps we have a faulty modem? We're using a DPC3941T and I think it was installed/replaced about 6 months ago.

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