Here's an odd one...
Due to the great sale they had on the Stick+ recently I ended up buying one and putting it in my living room. I've had many Rokus there, going back all the way to the original. The Wifi reception has always been excellent since the Router is in the den which is about 28 feet away and only separated by a partial wall (a doorway without a door).
Recently I had the new 2017 Stick there. Before that was the older 2016 Stick. Both said Excellent. The 2017 Stick is now in the bedroom, much further away and many walls in between, it now bounces back and forth between Good and Excellent.
The Stick+ in the living room constantly says Good, it never said excellent. I just find this odd because it's supposed to have better reception than the other sticks with that little dongle. The actual viewing experience is perfect. But it's strange that it doesn't say excellent for the reception. Anyone else notice the Stick+ reception seeming less than the other Sticks? Maybe the Stick+ uses a different scale since it can go much further?
What wifi band are you using? I notice that my Stick+ shows poor-good on 5Ghz but excellent on 2.4Ghz.
Also are all the Sticks powered off TV USB or wall charger?