I have several ruko devices. It will find my network, but I can not log in. If I do get in, it might logout, a day or to later, and I can't get back in. Help
If you provide more information such as Roku model and your ISP we could assist you more
If you are receiving error code 14.30 or 14.40 error code and have a cable ISP gateway (Xfinity/Comcast, Cox, or AT&T) gateway), recent firmware updates to these routers over the past months have caused connection and streaming issues with Roku 2.4ghz-only devices. (Roku Express 3930/3931/LE and Roku Premiere 3920/3921).
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The initial troubleshooting step is to verify that [ b/g/n ] Wireless Mode or Protocol is Enabled in your gateway's (router) wireless settings under the 2.4 ghz band.
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Restart both your Router and Roku devices(s) after making the above changes.
Xfinity / Comcast → ( https://www.xfinity.com/support/articles/change-wifi-mode-admin-tool-xfinity-xfi ) with a walkthrough ( https://community.roku.com/t5/Network-Wireless-Wired-Connections/Error-014-30-stuck-for-three-days/m...)
Cox → (https://www.cox.com/residential/support/managing-your-in-home-network-with-my-wifi.html)
AT&T → (https://www.att.com/support/article/u-verse-high-speed-internet/KM1046172). You can select your appropriate router from the drop down menu.
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Feel free to post back with an update or if you need more help.