I have 2 Roku Ultras in two different rooms. One of them stopped using the internet in the middle of a show. It showed connected, yet would not show connected to the internet and gave error 016. I unplugged and replugged. I reset network connections. I tried a different network connection. I factory reset and it once again found my wifi connections and connected. It moved to the activate your Roku player screen and then gave error Not connected to the Internet Error 016. I hooked it up the power and tv cable that my working Roku is using in another room. Same issue. I checked my router settings again. Still not working. Yet my other one is working just fine.
Your problem may have been caused by an update to your router which affects some Roku models. The update changes the router's wifi connection parameters from b/g/n to g/n. This has been reported with equipment from Comcast/Xfinity and Cox, and more recently ATT, but there may be others.
Affected users report the Roku identifies the local network as available and rates the connection quality, but will not then connect. The fix is to switch the router configuration protocols from the g/n wifi set by the update back to b/g/n.
If you don't have access to your router's configuration controls you may have to have your internet provider do it for you.
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Streaming Stick 4K+ 3821 | Streaming Stick+ 3810 | TCL Roku TV 43S245/C107X
For whatever reason it started working again. Left it disconnected for 24 hours. Then hooked it back up the next day and no problems. It’s most likely the device and not the network as I have two of the same models and narrowed down the problem to that one device.