I own 3 Roku TVs and all of the apps launch on my TVs. You might want to restart your devices from the system menu.
Ther reset doesn't work. Furthermore, it doesn't matter how many devices you have since it is not caused by hardware. The problems always occur in the evening when there is heavy usage and is related to backend database performance. The queries need to be optimized. Roku knows this already but will not admit to it publicly.
My 3 tvs are always on and streaming during very busy times.
Good for you, but what about the multiple users reporting the same issues over and over again. Do you think we are just making stuff up to be a pain in the ***?.