Two quick issues and I was wondering if you guys could chime in? When watching YouTube in Safari after a little while the video will freeze but continue audio. I have to shake the mouse or leave the mouse on the scrub bar to keep the video playing. I don't have flash installed and I'm thinking this is an issue with the entry-level 2015 CPU capabilities. Any thoughts? Also, some of the keys seem to be sticking for some reason. I keep this thing in immaculate condition but I'm noticing some weird anomalies with the keys and how the click. I bought it refurbished only a few months ago so it still has AppleCare.