Is there any quality difference between the 5 roku models

As it happens I just got a Roku stick as a gift. Liking it so far. No issues streaming via WiFi (but to be honest all my previous streaming via my phone and my Blu ray was via WiFi also). Two things:

I thought it was weird that they required a Credit Card from me.

It’s a little weird it can’t be turned off.

Otherwise I like it.

It’s in front of my TV, so I suspect it gets plenty of air. I don’t recall it ever feeling even warm to the touch. It’s close enough to the router where I even ran an Ethernet cable to it for a while to see if it would help (it didn’t). It could totally be the time of day/service related. Like most people I watch TV in the evenings so that’s when I notice the problems. I’m also on ATT Uverse. However I don’t think that’s the problem; as the box reboots itself occasionally after some of the freeze ups. I’m almost ready to just get another one just to see if it will make a difference.