I have an Onn Roku TV that worked well for a couple months, but now every time I turn it ON, it says it is not connected. Going through network setup it sees the Wifi, but will not connect, despite other devices having no issues. I have tried soft reset, resetting router, etc. The only thing that has helped is Restarting the System through System -> Power -> System Reset. After this reset is performed, it connects very quickly. Then, if the TV is turned Off then On again, it will not connect until I do another system reset.
This is extremely frustrating. I've also checked for system updates, one was installed, but has made no difference.
Please help!
Try enabling "Fast TV start" under Settings->System->Power (or Settings->Power; I can't remember).