For a few months now, yes. I posted about this in another thread earlier today, but basically the thing barely functions after a few cycles of rest mode. I'll turn it on and find it stuck on hulu/netflix/Amazon like I left it, but going to the dash just freezes it for minutes until it crashes.
Sometimes it doesn't crash, but the controller inputs seem delayed; I'll hit the home button, move around the squares a bit to see if it's working, then a few moments later it'll jump back to the app open in the background and everything I pushed seems to input all at once.
General menu navigation seems shitty with or without rest mode, but it does improve when shut down completely.
My earlier post was about my controllers just not responding; in the middle of a game my DS4 stopped working out of nowhere, so I tried all the tricks to fix it (connecting it to the PS4, resetting the controller, holding share/PS buttons, etc.), then tried using all of my other controllers, and none worked. This is the first time that's happened to me with almost daily use since launch, so I figured it was another step in my PS4 breaking down, but it's apparently not that uncommon.