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Unstable Home Cable Internet, Blinking Uplink Light
Hello all. I have been struggling with an unstable home internet connection. I have Xfinity Cable Internet, a Netgear CM400 Modem, and a TP-Link AC1200 router that I primarily connect to via Ethernet.
Since moving into a new home, my internet has been somewhat functioning but very unstable. The uplink light on my modem blinks about 50% of the time, whereas the downlink light is steady green. While browsing, I get frequent 5-10 second periods when the internet is unresponsive, and I get 2-3 full disconnects per day requiring me to restart my modem. Here are the channel statistics from my modem:
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Here is my modem's event log, covering just two hours:
| Time | Priority | Description |
| May 4 19:13:35 2022 | Critical (3) | No Ranging Response received - T3 time-out |
| May 4 19:15:08 2022 | Critical (3) | Ranging Request Retries exhausted |
| May 4 19:15:09 2022 | Critical (3) | 16 consecutive T3 timeouts while trying to range on upstream channel 2 |
| May 4 19:15:09 2022 | Warning (5) | TCS Partial Service |
| May 4 19:15:11 2022 | Error (4) | DBC-ACK not received |
| May 4 19:15:38 2022 | Critical (3) | Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out |
| May 4 19:32:24 2022 | Critical (3) | No Ranging Response received - T3 time-out |
| May 4 19:37:40 2022 | Critical (3) | Ranging Request Retries exhausted |
| May 4 19:37:40 2022 | Critical (3) | 16 consecutive T3 timeouts while trying to range on upstream channel 2 |
| May 4 19:37:47 2022 | Critical (3) | Ranging Request Retries exhausted |
| May 4 19:37:47 2022 | Critical (3) | 16 consecutive T3 timeouts while trying to range on upstream channel 4 |
| May 4 19:37:52 2022 | Critical (3) | No Ranging Response received - T3 time-out |
| May 4 19:38:07 2022 | Critical (3) | Ranging Request Retries exhausted |
| May 4 19:38:07 2022 | Critical (3) | 16 consecutive T3 timeouts while trying to range on upstream channel 3 |
| May 4 19:38:07 2022 | Warning (5) | TCS Partial Service |
| May 4 19:38:09 2022 | Error (4) | DBC-ACK not received |
| May 4 19:38:37 2022 | Critical (3) | Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out |
| May 4 19:57:36 2022 | Critical (3) | No Ranging Response received - T3 time-out |
| May 4 20:01:50 2022 | Critical (3) | Ranging Request Retries exhausted |
| May 4 20:01:51 2022 | Critical (3) | 16 consecutive T3 timeouts while trying to range on upstream channel 3 |
| May 4 20:01:54 2022 | Critical (3) | No Ranging Response received - T3 time-out |
| May 4 20:02:20 2022 | Critical (3) | Ranging Request Retries exhausted |
| May 4 20:02:20 2022 | Critical (3) | 16 consecutive T3 timeouts while trying to range on upstream channel 2 |
| May 4 20:02:39 2022 | Critical (3) | No Ranging Response received - T3 time-out |
| May 4 20:04:38 2022 | Critical (3) | Ranging Request Retries exhausted |
| May 4 20:04:38 2022 | Critical (3) | 16 consecutive T3 timeouts while trying to range on upstream channel 4 |
| May 4 20:04:38 2022 | Warning (5) | TCS Partial Service |
| May 4 20:04:40 2022 | Error (4) | DBC-ACK not received |
| May 4 20:05:08 2022 | Critical (3) | Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out |
| May 4 20:22:48 2022 | Critical (3) | No Ranging Response received - T3 time-out |
| May 4 20:28:16 2022 | Critical (3) | Ranging Request Retries exhausted |
| May 4 20:28:17 2022 | Critical (3) | 16 consecutive T3 timeouts while trying to range on upstream channel 2 |
| May 4 20:28:33 2022 | Critical (3) | Ranging Request Retries exhausted |
| May 4 20:28:33 2022 | Critical (3) | 16 consecutive T3 timeouts while trying to range on upstream channel 3 |
| May 4 20:28:49 2022 | Critical (3) | No Ranging Response received - T3 time-out |
| May 4 20:29:01 2022 | Critical (3) | Ranging Request Retries exhausted |
| May 4 20:29:01 2022 | Critical (3) | 16 consecutive T3 timeouts while trying to range on upstream channel 4 |
| May 4 20:29:01 2022 | Warning (5) | TCS Partial Service |
| May 4 20:29:03 2022 | Error (4) | DBC-ACK not received |
| May 4 20:29:31 2022 | Critical (3) | Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out |
There is one Commscope brand 'subscriber amplifier' splitter, model CSMAPDU9VP, between the incoming cable and the wall cable ports around the unit. I have tried plugging the modem directly into the splitter on an unused port, and also disconnecting the splitter entirely and plugging the input line directly into the modem. In both cases, I get exactly the same behavior as before -- somewhat working connection, but blinking green uplink light and disconnects at regular intervals. There are no other splitters than I am aware of.
It has been frustrating to deal with the unstable internet. I would greatly appreciate any help with getting to a more consistent connection.
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