DOCSIS issue

Question

My modem log shows repeated kernel-panic reboots, SYNC Timing Synchronization failures, and T3 timeouts, all indicating a clear problem with upstream/downstream signal quality on the line or at the node. The modem frequently loses its DOCSIS 3.1 lock and falls back to DOCSIS 3.0, which also explains the reduced speeds.

This is not a LAN issue. These are network-level signal faults.
I kindly request an on-site technician visit with full signal measurement ( SNR, downstream/upstream power, OFDM stability, outdoor connectors, and tap/not check).

Please escalate this issue, as it is persistent and severely impacting service reliability.

Client62 · Answer

Look at the last entry in the log you posted.&nbsp;We can all see the kernel panic message.&nbsp;This is a defective Hub.

gitty · Answer

Can you post a more complete log (as text)? The events just after a crash/reboot are somewhat meaningless.

Client62 · Answer

Intel Atom CPU Kernel Panic Restarts are a fault of the Intel CPU in the VM Hub.
The only fix is to request a replacement VM Hub.

If you have DOCSIS signal level concerns, share the contents of the Upstream and Downstream
status tabs for review.

Amithyel · Answer

This is the 2nd hub I got within a year. I don't think is the issue.&nbsp;

Amithyel · Answer

If the modem were defective, it would not display SYNC Timing Synchronization failures, T3 timeouts, DS profile reassignments or OFDM instability before rebooting. These specific events indicate clear network-side signal issues rather than a hardware fault. The kernel panic is a secondary reaction to these failures, not the root cause.I am absolutely fine with replacing the modem if necessary, but please escalate this case for a full line and node-level signal check, because the logs clearly point to upstream/downstream timing instability.A faulty modem does not produce upstream ranging timeouts, as those originate from the CMTS side.If the modem itself were faulty:- it would reboot randomly without any preceding signal errors- kernel panics would occur without timing or synchronization problems- there would be no SYNC Timing Synchronization failures- there would be no T3 timeouts- the DS profile would not change- the DOCSIS 3.1 lock would not drop or become unstable

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DOCSIS issue

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