Good discussion.
I think Netflix is unique in two ways:
It is the most used, so the most likely to be in use when a reboot occurs,
-and-
It uses a unique buffering mechanism: It seems it immediately plays a low bandwidth stream while it's buffering a second and maybe third higher band stream. I notice it starts playing almost immediately and then the image "solidifies" into HD after 10 or 20 seconds. It may also downgrade (saw this a lot during the Netflix/Comcast wars) implying that while it's playing one stream, another is being buffered in the background "just in case." This behavior must use gobs of memory other channels don't. A memory leak is more likely to become critical when viewing Netflix.
I take it the aux SD memory can't be any benefit to the actively viewed channel; it is not working storage (just a swag, but the properties of flash memory would render it too slow for anything but non-volatile storage). So I won't be plunking an SD card in. And RokuShawn, of course you can comment on current issues. You can qualify your comments so we don't hold you to them in a court of law. Something like: "engineering recognizes a problem and is still analyzing. Will advise when there is a potential fix. If anyone would like to beta test the fix, please be sure to sign up." I don't wish to sign up as an elite guinea pig in order to get meaningful updates. If you keep us in the dark, we'll defect to other products. Roku is no longer the only netflix box on the block.
My tolerance is waning, Roku. This would be a high-level problem on any other platform (not critical as the work-around is to tolerate frequent reboots).