I don't think the memory has anything to do with it, as the specs are the same on the other 2 boxes. I see some people posting about problems with KODI andthe U9. I don't have issues, but I went through the settings on both the Android and in KODI and changed things. I also deleted or disabled any apps that I will never use, (which is most of them). As an example, I had playback, sound, slowness and lockup issues with my NEO X8 H PLUS. I did the same thing, I went through and removed my bloatware, and in KODI, I tweaked the settings until everything was perfect. The only thing I ever had to do after that was adjust the volume playback defaults to match my other device settings. So for everyone having U9, U1, X8 H PLUS issues, start with the android settings, using an app for movies or streaming, and make adjustments there. Then load KODI or other and go to settings and play with decoders and other settings. One last thing, internet speed plays a huge part. Make sure you have a fast, smooth internet connection. My Daughter was having lagging, freezing movies. It turned out she was on slow RR 10mbps feed. She called her provider and they sent her a new router and increased her dl speed to 100 mbps and problem solved. Another example of an overloaded box. My Son In Law had a U1 box he loaded with so much crap, it didn't have enough free memory to do anything. I removed all the add ons he did not need and disabled or removed all the unneeded apps. Now it flies and is very smooth. Just some food for thought.