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CM3000 Repeated Cox disconnects with SYNC Timing Synchronization failure
The CM3000, which I have owned for <30 days, is having repeated disconnection issues. Cox is my ISP. The disconnections occur randomly, but multiple times per day and always require a hard reboot. Th...
Thanks, iFrog. The first Cox service reps who came out identified a number of issues with the lines, which were probably 30 years old and revealing signal degradation. He replaced every line and connection from the modem out to the street and even some in the local area. The infrastructure is now pristine. Curiously, the upload channel issues appeared only after all the upgrade work was done.
I did notice that on those occasions when the cable modem connection status shows "Good" the diagnostic information shows that Upstream Channel OFDMA #1 is locked. The modem then (apparently) encounters a condition that flips it "Poor" with OFDMA Channel #1 unlocked.
If you take a look at this Reddit thread, it suggests the latest firmware for this modem is partly responsible for the issues:
https://www.reddit.com/r/NETGEAR/comments/1kxeazx/cm3000_cable_modem_new_firmware_v60103_slow_webui/