I have a Westinghouse Roku TV that is less than 4 months old.
All of the apps and the system is up to date as of the time of this message.
I have gigabit Ethernet connected so it's not a bandwidth issue
Multiple apps will load and allow you to browse and select something to watch only to have the app boot you back to the home screen after approximately 30 seconds.
I have tried removing the app powering down the TV and reinstalling it but it persists.
As of the time of this message I have replicated the issue on Netflix and Prime and Disney