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MR80/MS80 speeds collapse to 5–7 Mbps until reboot
I have an MR80 router with one MS80 satellite. The system initially performs well after rebooting (with download speeds of over 500 Mbps even on Wi-Fi devices connected to the MS80 satellite), but af...
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During the degraded state:
- A desktop computer connected by Ethernet behind the MS80 drops to approximately 5-7 Mbps.
- Wi-Fi devices connected through the MS80 experience the same severe slowdown.
- Wi-Fi performance near the MR80 has also been reduced, although not always as severely as performance through the MS80.
- The MR80's internal Internet speed test continues to report more than 900 Mbps.
I have not yet tested an Ethernet-connected computer directly at the MR80 during the degraded state, nor have I tested whether the problem develops with the MS80 powered off. I will perform both tests the next time it occurs.
The modem is a Netgear CAX80 operating in modem-only bridge mode, so the MR80 is the only active router. The connection between the modem and MR80 is capable of delivering more than 900 Mbps, as confirmed by the MR80's internal speed test.
I have one MS80 deployed.
My home is approximately 1,000 square feet. The distance between the MR80 and MS80 is approximately 40 feet, with one wall between them.
My current wireless channels are Auto on 2.4 GHz and 48 on 5 GHz. I have also tried channel 44 on 5 GHz.
Both units are running firmware version 1.1.8.20. After installing this firmware, I factory-reset the MR80 using its physical reset button and reconfigured the network. I have not independently factory-reset the MS80 using its physical reset button since the firmware update.
The most notable evidence is that the connection changed abruptly from 504 Mbps download and 110 Mbps upload to 7.35 Mbps download and 5.72 Mbps upload within approximately ten minutes, while idle latency and packet loss remained normal. The degraded speeds then persisted across multiple independent Speedtest servers.
The problem has become significantly more frequent. The speed degradation is now occurring every few hours rather than every several days. Yesterday, I observed the connection drop back to approximately 5-7 Mbps only about 30 minutes after normal performance had been restored. Rebooting still restores normal speeds temporarily, but the interval before the next slowdown is becoming increasingly short.
What FW is on the CAX80 thats in modem only mode?
Please post a copy and paste of the modems connection status and event log page.
MS and MR would need to be factory reset at the same time to help check this.
Update since my last post:
I factory-reset the CAX80 and regained access to its administration interface.
CAX80 information:
- Hardware version: 1.01
- Firmware version: V5.1.1.8
- Cable firmware version: V1.02.08
The CAX80 cable diagnostic reported Good for Internet access, downstream status, downstream power, downstream SNR, upstream status, and upstream power.
All 32 downstream channels were locked. Downstream power ranged from approximately -3.5 to -4.9 dBmV, and downstream SNR ranged from approximately 41.5 to 43.6 dB. All displayed correctable and uncorrectable counts were zero.
Four upstream channels were locked with power levels between approximately 34.0 and 35.3 dBmV.
The event log recorded Dynamic Range Window violations, upstream profile changes, commanded-power adjustments, and one synchronization failure/loss-of-sync event during the several minutes immediately following the CAX80 factory reset and reprovisioning. The modem subsequently reported a good connection and received valid IPv4 and IPv6 addresses.
A direct Wi-Fi test through the CAX80 measured 1,112 Mbps download. I then returned the CAX80 to modem-only/bridge mode.
During a short healthy-state comparison through the MR80:
- With the MS80 powered on: 378 Mbps download and 114 Mbps upload
- With the MS80 powered off: 467 Mbps download and 119 Mbps upload
I have not yet operated the system long enough with the MS80 powered off to determine whether the recurring degraded state develops without it.
I then completed the suggested simultaneous factory reset. I factory-reset the MS80 first and immediately factory-reset the MR80. Both units were configured from scratch without restoring a saved configuration. Both are running firmware V1.1.8.20_3.1.112.
Post-reset results:
MR80 internal Internet test:
- 946.50 Mbps download
- 115.39 Mbps upload
- 7 ms ping
Wi-Fi device connected through the MR80:
- 516 Mbps download
- 114 Mbps upload
- 14 ms idle ping
- 1 ms jitter
Desktop computer connected by Ethernet through the MS80:
- Before reset: 574.01 Mbps download, 113.68 Mbps upload, and 17 ms ping
- After reset: 560.26 Mbps download, 115.10 Mbps upload, and 26 ms ping
The current wireless settings are Auto on 2.4 GHz and channel 44 on 5 GHz. I have restarted the monitoring script and will leave the configuration unchanged. If the degradation returns, I will capture the MR80 internal test, direct MR80 Ethernet and Wi-Fi tests, MS80 Ethernet and Wi-Fi tests, router uptime, and backhaul status before rebooting anything.
Screenshots of Event Log and Connection Status are from after CAX80 reset and before entering bridge mode.
While in bridge mode on the CAX80, you can access it's web page while in bridge mode at 192.168.100.1. You don't have to revert back to router mode to access it's web page.
Any Criticals, Errors or Warnings seen in the event logs needs to be reviewed and resolved by the ISP. Indicates a signal issue on the ISP line up to the modem.
What WiFi device are you using? Brand and model#?
What brand and model# ethernet adapter are you using?
Might test with MR online only while MS are turned off to see if there is any speed degradation first.
I would set manual channel on 2.4 and 5Ghz. 1 and 40 or 11 and 48.
Any Wifi Neighbors near by?
