Posting as I've not see anyone else having this issue. Might save someone some hassles.
I've been an RCN customer for about 3 years on the 50 Mbs service, using my own provided modem, Arris SB6141. Never had any issues.
On Tuesday, 6/20, my service stopped working. Turns out that 2 other people lost their service at the exact same time. I live in a condo unit and the cable junction room was rewired 2 weeks ago to meet fire code, so I assumed it was an issue with the rewiring there. It looked ok, when I found my RCN connection to the main connection in the junction box.
On Wed, 6/21, technician shows up, checks my cable coax and hooks up his 8 channel modem successfully, declares my modem broken and offers to rent me an RCN modem, which I decline. Surprisingly doesn't charge me for the service call.
On Fri, 6/23, amazon delivers new SB6141. Initially it pulls around 6 Mbs, which is odd. By the next morning it is no longer connecting and RCN tech support can't help.
On Sat, 6/24, I successfully connect to a new Netgear CM600 (24 channel modem). After some initial issues (took long time to provision), it connects and works fine. It only uses 16 channels.
TL;DR My guess is that RCN has made some infrastructure changes in my neighborhood that renders the SB6141 or other 8 channel modems incompatible. I negotiated an account service upgrade to 155 mbs and I am getting that performance now on the CM600.
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