I may be wrong, but I am beginning to think that the reason some android tvs have problems may be with the small internal memory of the tv or memory leakage between running programs. Google likes to run and keep loaded in internal memory a many programs that are not needed. This causes a sluggish op system response, especially when using the menu system of the tv. The sluggishness is very noticeable when opening and closing many programs within a short time span.

I uninstalled, or forced stopped as many programs that Google will allow and noticed a slight improvement in system response. The other option is to install a large fast usb stick in the usb 3 port and allow Google to transfer the uninstallable apps to the usb stick. I was going to try that, but haven't gotten around to it yet.

The only time I've had a frozen tv was when I installed the Tablo program to try out. I did not have to unplug the tv, the tv rc allowed me to shut it off and re-start it.