azleb Posted June 25 Share Posted June 25 Hi all, I'm running into a frustrating issue with my router since updating to firmware version 4.0.540. Whenever I download at max speed (~900Mbps), the internet drops and I get a DNS error. The only way to restore the connection is by rebooting the router. This happens consistently during high-speed downloads. Has anyone experienced this or know of a fix? Could this be a firmware bug, DNS issue, or something else? Any suggestions or other troubleshooting steps would be greatly appreciated! Cheers, Azleb Link to comment Share on other sites More sharing options...
Administrators Netduma Fraser Posted June 26 Administrators Share Posted June 26 Please re-create the issue and then grab the logs as soon as it happens and we can take a look. Does it happen wherever you download or on a specific site? Does it happen with any device downloading? What is the model of the modem/router the R3 is connected to and how have you set that to ensure all traffic flows to the R3? E.g R3 in its DMZ, modem/bridge mode Are ALL devices connected to the R3? What are the speeds you pay for/receive? Have you entered those speeds into the router? How have you setup Congestion Control? How have you setup SmartBOOST? Link to comment Share on other sites More sharing options...
azleb Posted June 26 Author Share Posted June 26 Hi @Netduma Fraser Long time no speak I hope all has been well. I recreated it this morning and it dropped out. I have attached the logs to the post. Does it happen wherever you download or on a specific site? Does it happen with any device downloading? - No specific site. It happens when I download games on my ps5, my personal pc and server. All connected at different points within the house. What is the model of the modem/router the R3 is connected to and how have you set that to ensure all traffic flows to the R3? E.g R3 in its DMZ, modem/bridge mode - Only the R3, its connected to a unmanaged switch in my data cabinet and have cat 6 throughout the house. Are ALL devices connected to the R3? Yes besides the Nighthawk X6 Tri-band WiFi Mesh Extender EX7700. What are the speeds you pay for/receive? Pay 1Gbps I get 946Mbps Have you entered those speeds into the router? Yes and I have attempted to reduce it to 800Mbps still same issue How have you setup Congestion Control? Yes and removed it to test, same issue How have you setup SmartBOOST? Yes and removed it to test, same issue I hope this helps, thanks mate R3_2025-06-26T22_38_21.873Z_logs.txt Link to comment Share on other sites More sharing options...
Administrators Netduma Fraser Posted June 26 Administrators Share Posted June 26 All good thanks, hope you are too! How did/do you have Congestion Control/SmartBOOST set though? Did you reboot the router? If so did you get the log after the reboot? Looks like that's what happened but If not, what time did it happen approximately? Link to comment Share on other sites More sharing options...
azleb Posted June 26 Author Share Posted June 26 I have attached the images of my setup It happened just before the reboot; the internet won't go back online unless I do the reboot. I thought it would be good to capture that in the logs Link to comment Share on other sites More sharing options...
Administrators Netduma Fraser Posted June 27 Administrators Share Posted June 27 Remove the File Sharing priority and monitor it. Congestion Control can be found in Ping Optimizer > Advanced. If you could grab the logs before the reboot that would be great, otherwise the risk is that the logs pertaining to the issue are lost which is what happened there Link to comment Share on other sites More sharing options...
azleb Posted Sunday at 11:22 PM Author Share Posted Sunday at 11:22 PM Hi @Netduma Fraser I made some changes with the Congestion Control, and it dropped out. I did get the logs before I rebooted this time. Thanks mate R3_2025-06-29T23_13_58.139Z_logs.txt Link to comment Share on other sites More sharing options...
Administrators Netduma Fraser Posted Monday at 02:09 PM Administrators Share Posted Monday at 02:09 PM The only thing the logs indicate is the DHCP lease changing so in DHCP settings set the lease to 10000 and give all devices a static/reserved IP - super quick to do on the R3. Once you've done that reboot the router from the interface, wait 4 minutes before accessing and monitor from there Link to comment Share on other sites More sharing options...
azleb Posted Monday at 10:04 PM Author Share Posted Monday at 10:04 PM Thanks Fraser, I’ll give it a shot and report back. There is one thing I’m curious about though. It only started happening when the new update come out a few months ago. Could it be that I have cloudflare DNS in the router? Maybe that is important info I forgot to mention. Link to comment Share on other sites More sharing options...
Administrators Netduma Fraser Posted Monday at 11:04 PM Administrators Share Posted Monday at 11:04 PM No it won't be that, the error on the web browser is a standard no internet message. DNS maps domain names e.g. Google.com to IP addresses e.g. 8.8.8.8 so that when you go to Google.com you get connected to the 8.8.8.8 IP address and the content is displayed. With no internet that DNS process can't happen which is all it's really saying, I've tried to determine the IP address of this website you want to connect to but I'm unable to. azleb 1 Link to comment Share on other sites More sharing options...
azleb Posted Tuesday at 12:17 AM Author Share Posted Tuesday at 12:17 AM I have reserved all the IP's and will test maybe same time tomorrow and report back. Link to comment Share on other sites More sharing options...
azleb Posted Tuesday at 05:51 AM Author Share Posted Tuesday at 05:51 AM Hi Fraser Dropped out again I got logs from before and after. Is there something that can be done to prevent having to reboot to get back online? R3_2025-07-01T05_28_08.901Z_logs.txt R3_2025-07-01T05_24_01.845Z_logs.txt Link to comment Share on other sites More sharing options...
Administrators Netduma Fraser Posted Tuesday at 02:31 PM Administrators Share Posted Tuesday at 02:31 PM From the first log I can't really tell too much, appears to be only 4 minutes long and it starts by starting up the WiFi so I don't know if WiFi details were changed or the issue was before that entry but the rest could be it just starting up again Link to comment Share on other sites More sharing options...
azleb Posted Tuesday at 09:38 PM Author Share Posted Tuesday at 09:38 PM Hey mate The one R3_2025-07-01T05_24_01.845Z_logs was when the drop out happened before reboot. I was working from home and didn't touch the router at all; this was two hours after I gave all my devices reserved IP's+ reboot. The other log was after the reboot R3_2025-07-01T05_28_08.901Z_logs. Link to comment Share on other sites More sharing options...
Administrators Netduma Fraser Posted Tuesday at 10:24 PM Administrators Share Posted Tuesday at 10:24 PM There really isn't much there indicating an issue, just the DHCP lease which should be taken care of with the changes you made but ensure all devices do have a reserved IP and then disable DHCP on the router, reboot from the interface and monitor from there azleb 1 Link to comment Share on other sites More sharing options...
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