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Internet keeps dropping when downloading very large files, power cycling modem fixes it
Whenever there's a substantial amount of data being transferred (downloading a large file over a sustained period of time will do it) my modem dies. The cable modem's web portal doesn't respond so I can't even log in to look at the channel it's on or any of it's information. Rebooting it fixes the problem for awhile (but often not very long; i.e. 20 minutes or 30 minutes if I keep downloading.)
It's a DOCSIS 2.0 modem because one of the channels gets interference from a nearby Verizon cell tower due to the shielding having been gnawed through by squirrels. (I know, sounds like a crazy conspiracy theory. I feel silly just describing it.) Because DOCSIS 3.0 will just randomly hop onto a bad channel and stay there and have your overall connection fail as a result, while the DOCSIS 2.0 one will switch to a healthy channel if it does (because it only uses one), I've been using a DOCSIS 2.0 modem for several years intentionally upon recommendation from the Comcast tech and it's generally been stable until the last month.
GATEWAY STATUS
Initilization Procedure
| Vendor Name | SMC Networks |
| Hardware Version | 1A |
| Serial Number | (Ask) |
| Firmware Version | 4.01.21-CCR |
| Operating Mode | RG |
| System Uptime | 000 days 00h:18m:34s |
| Date | JUN-07-2015 |
| Time | 07:23:37 |
CABLE MODEM
Initilization Procedure
| Initialize Hardware | Complete |
| Acquire Downstream Channel | Complete |
| Upstream Ranging | Complete |
| DHCP Bound | Complete |
| Set Time-of-Day | Complete |
| Download CM Configuration File | Complete |
| Registration | Complete |
| TRAFFIC ENABLED |
Downstream Channel
| Downstream Frequency | 561000000 Hz |
| Lock Status | Locked |
| Modulation | 256 QAM |
| Symbol Rate | 5.360537 Msym/sec |
| Downstream Power | 5.2 dBmV |
| SNR | 36.888 dB |
Upstream Channel
| Upstream Frequency | 36700000 Hz |
| Lock Status | Locked |
| Modulation | 64QAM |
| Symbol Rate | 5120000 sym/sec |
| Upstream Power | 40.6 dBmV |
| Channel ID | 40 |
train_wreck
Gold Problem solver
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610 Messages
9 years ago
Where is the shielding broken? If it is on the coax cable coming in from the street, then Comcast will fix that for free. If it's on the wiring inside your location, then you'll have to replace it yourself. Either way, it can absolutely cause this problem. It's not crazy to say that cell tower interference carries over onto coax wiring; it does, and breakage in the line makes it all the more easy for those signals to leak in. I even see it in my perfectly functional line, manifesting as higher error counts on ~700MHz channels.
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