I set up a G54 modem in my home in November, and configured my wifi networks using Split Mode. I had most of the devices connecting to the 5GHz network perfectly fine for a while. They were routinely getting speeds in the 400-500Mbps range. Then suddenly a couple weeks ago none of the wireless devices in my home were able to detect any of the networks except for the 2.4GHz one, and they were only getting speeds of ~50Mbps.
According to the modem’s Admin GUI the 5GHz radio, 5GHz High radio, and 6GHz radio are all enabled and active. I tried a factory reset and turned Split Mode back on. Once again, my wifi devices could only detect the 2.4GHz network. I then disabled Split Mode and enabled Band Steering, hoping that they would get automatically directed to the faster band. But the Connected Devices page showed everything connected on the 2.4GHz band, and speed tests showed I was only getting ~50Mbps on that band. I tried enabling the Guest Network with the same results.
I have a desktop PC directly connected to the modem with an ethernet cable and it’s able to get speeds of ~800-1,000Mbps, so this issue is specific to the Wifi.
Wireless interference shouldn’t be the issue. My laptop is 10 feet away from the modem with nothing in between them. I did run the Wi-Fi Spectrum Analyzer. There is very little interference from other signals in the 5GHz spectrum, but regardless I tried changing the 5GHz channel from Automatic to all of the possible options: 36, 40, 44, and 48. None of those channels enabled my wireless devices to detect the 5GHz network.
I spent an hour on the live chat with tech support earlier today trying to diagnose the problem. They said that the power level of my Upstream QAM to my ISP was too low. This makes no sense because if there was a problem with the connection to my ISP I would experience issues with every device - including the desktop PC on the ethernet connection. But that’s working just fine. The rep I was chatting with seemed incapable of understanding this, or explaining what kind of issues the Upstream QAM power level would cause. But just in case - if anyone wants to see that Upstream QAM data here it is:
Upstream QAM
| Index | Frequency (MHz) | Power Level (dBmV) | Channel Type | Symbol Rate (KSym/sec) | Modulation | Lock Status |
|---|---|---|---|---|---|---|
| 3 | 30400000 | 38.020599 | US_TYPE_ATDMA | 5120 KSym/sec | 64QAM | Locked |
| 4 | 36800000 | 38.270599 | US_TYPE_ATDMA | 5120 KSym/sec | 64QAM | Locked |
| 2 | 24000000 | 38.020599 | US_TYPE_ATDMA | 5120 KSym/sec | 64QAM | Locked |
| 1 | 17600000 | 38.020599 | US_TYPE_ATDMA | 5120 KSym/sec | 64QAM | Locked |
At this point I’m at a loss of what to do next. Does anyone have suggestions on how to get the faster wifi bands working again?
Thanks.