OTOH, my October 2015 S90D is encountering slowdowns after a few days/weeks... It improved by removing most of Nav history; It appears somewhat better everytime I reboot the 17" for a while; but I do believe there is something going on with my having a large, as in 16,000 music tracks on an over 128GB USB stick I use in my MS. I'm gradually working my way through different sized USB sticks, different combinations of folder depths, varying number of tracks, and use of Folders vs other tabs that do and don't show album art, as Tesla fails at consistently showing album art via each of the tabs using Gracenotes and then caching some amount of art, but never uses imbedded Album Art that wouldn't require as much processor capacity or storage to maintain. Just as some have found with Nav History, even without being able to yet pinpoint the USB issue, something seems to also be going on by my having a relatively large amount of personal USB music connected to Media Player (and what I have is less than half what I used to have accessible with my physical iPods in previous Lexis and MBZ I sold and replaced with my single MS). As I've said in other threads, Tesla either has a memory mgmt, tasking priority issue, and/or isn't setting proper limits on what their software should accommodate to match the hardware memory and paging limitiations that exist in their Linux implementation. Even though I can't prove it (yet) as a fact, my slowdown and unresponsive problems seem to sadly get worse with each firmware release as a Tesla introduces new functions -- supporting my hypothesis of where the problems exist.
Time for a little more basic maintenance that does not appear to have been attended to thus far.