Ethernet connection gets lost randomly when using an android stick

[AC Question]

I am using a digital signage app called viewneo on an android stick in version 4.2.2. I connect it to ethernet with a RJ45 ethernet to USB 2 adapter and set up a static IP address and gateway etc., making sure it's turned on and wi-fi is off. It will connect, I can start the app and be able to download content, but after a little while it gets disconnected without anything changing. The settings seem to be correct, I've tried different RJ45 adapters, and all the network ports are open and allowing access. If anyone has any ideas they would be greatly appreciated. Thanks!