While using my Roku Stick, I have found that I seem to have buffering issues with video - primarily while using Sling TV. Last night it took ~20 minutes for my Roku to finally "catch" TBS on Sling TV - and even then I had issues where the picture would pixelate and sound distort. I tried a reboot, and no luck. I did an internet speed test, and all appeared fine.
Any suggestions of what else to consider/try? The stick is only a couple years old - it shouldn't be worn out yet.