The tech from Comcast came on 11-6-2018 and measured and determined that the signal strength going to the modem and TV boxes was low; they want to see signal strength below -50 dB, mine was in the -55 dB range. The tech installed an AC powered distribution box (booster) that would maintain the strength of the incoming signal being distributed to all the TV boxes (4) and modem. After installation of this distribution box, the signal strength accross all my equipment improved to about -45dB and the issue with the Cisco DPC3941T modem was no longer duplicated. However, I still opted to replace the Cisco modem with the Arris TG1682G and since then I didn't have a single modem reset.
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I started experiencing the problem for about 3-4 weeks with the same Cisco DPC3941T modem that I received (as an upgrade) and installed on 8/22/2018. I also duplicated the issue as described below and found the following:
1. When I call the home phone from my cell phone and after the conversation I hung up the cell phone first, within 10-20 seconds my home phone has no tone, and after another 10-20 seconds the modem reboots.
2. If instead the coversation is ended by hanging up the home phone first and then the cell phone, there is no loss of tone or modem reboot.
I just finished talking to Xfinity tech support and will have a technician come tomorrow to look into the issue and also requested the tech to bring a different supplier modem - not the same Cisco DPC3941T; they have Arris and Technicolor as alternate modems. And, after finishing the conversation with Xfinity Technical Support and Customer Solutions, I lost phone tone and the modem rebooted.
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