Well I bought the firestick 4k as there was good offer and thought I'll try them out and anyway if I don't like it thought I'll buy mi4k as its anyway 3500 anyday. Now Been 2 days firestick audio quality and video clarity is excellent thrice better than what I get from tv native app 55q60r Samsung. But problem is I don't know how to explain as iam noob when it comes to home theatre and tv. But I could easily note the motion in the firestick is having trouble. Videos are jerky.Often u can see the chopping or stutter effect.It is not completely chopping it will be smooth and while running smooth it will be jerky as mentioned in regular intervals. Is it that firestick handling is bad in general or may be problematic in my unit? Also is mi4k better and will solve this? I do have a return window. Any help is appreciated.