Help & troubleshooting for network issues, including connecting your device to your home Wi-Fi network, connecting to public networks, troubleshooting wireless issues & ethernet connections, and optimizing streaming performance.
I'm having the same issue--that is, my Roku suddenly stopped picking up my home wireless network a few weeks ago.
Roku Model: 3900RW - Roku Express Serial Number: YG00EG363463 Device ID: C4389E363463 Software: 9.4.0 - build 4190-51 Router: Westell VersaLink Model 327W Frequency: 2.4 Ghz
I spent a very long, very frustrating 2 hours on on Roku support chat last night. It seems the MO is for Roku Support to blame the issue on the ISP. Instead of passing the buck, I would have been much happier had they owned the issue and said something along the lines of, "please bear with us as we atempt to resolve this issue yadda yadda yadda." I was very close to purchasing an Amazon Fire Stick until I discovered this thread. It appears Roku might be trying to fix the issue. Roku, I'll give you a couple of weeks before I jump ship to a Fire Stick. I just can't go that long without my re-runs of The Office.
There are many threads on this and the one common denominator seems to be having 802.11b mode enabled on your router, especially if you're using OpenWRT or DD-WRT.
This was the solution. After trying all kinds of things, the fix in OpenWRT on a Linksys WRT1200AC was to uncheck the "allow legacy 802.11b rates" setting, then Save, and Save and Apply.
The setting is under: Network->Wireless Click the Edit button associated with the 2.4GHz radio Go to Advanced Settings tab uncheck "allow legacy 802.11b rates" Save, then Save and Apply. Possibly reboot the router after this.