frames missing

Hi. I am new to Kodi, and the forum.
Purchased 2 of these from Amazon:
WISEWO T95Z PLUS Android TV Box Amlogic S912 Qcta-Core CPU 2.4G/5G Dual Wifi UHD 4K2K 3D Smart Mini PC HD Video Streaming Media Player with Wireless Keyboard Remote
Unit has Marshmellow and Jarvis 16.1
Do all android tv boxes shudder, or miss frames? My video is not smooth on about every stream…Im starting to think adroid tv is more hype than quality..