Internet Connection Issue

Hi, there. I’m experiencing issues with my internet connection, especially in the mornings when the connection becomes intermittent.

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Modem Model

Arris S33

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Issue Summary

Multiple occurrences of "Started Unicast Maintenance Ranging - No Response received - T3 time-out" along with "Dynamic Range Window violation" and "RNG-RSP CCAP Commanded Power Exceeds Value Corresponding to the Top of the DRW" errors indicating issues with upstream ranging and power levels.

Primary Issue: Frequent disconnects and degraded internet performance due to upstream communication failures.

Summary of Observed Issues

Type	Details
T3 Timeouts	Unicast Maintenance Ranging - No Response received
T4 Timeouts	No Unicast Maintenance opportunities received
Dynamic Range Violations	Modem transmit power exceeds or falls below acceptable range
UCD Errors	UCD invalid or channel unusable — upstream channel instability
Profile/Diplexer Errors	Repeated ignored or failed mode change requests between modem and CMTS

Signal Levels

Downstream

Metric	Observed Value	Ideal Range
Power	+8 to +10 dBmV	–7 to +7 dBmV (optimal)
SNR	43–44 dB	> 35 dB (good)
Errors	Up to 25,000 uncorrectables per channel	Should be near zero

Upstream

Channel	Frequency	Power
17	16.4 MHz	46.8 dBmV
18	22.8 MHz	47.0 dBmV
19	29.2 MHz	46.3 dBmV
20	35.6 MHz	46.3 dBmV

Note: Upstream power is borderline too high. Ideal is 38–45 dBmV; 47 dBmV indicates resistance or return path issues.

Sample Error Logs

- Started Unicast Maintenance Ranging - No Response received - T3 time-out

- Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out

- RNG-RSP CCAP Commanded Power Exceeds Value Corresponding to the Top of the DRW

- Dynamic Range Window violation

- UCD invalid or channel unusable