[wrxtasy]

Sounds like you have an old C1 case. The C1+ cases are also compatible with the C2.

For buffering I just use Example 4 as found here:
http://kodi.wiki/view/how-to:modify_the_video_cache

Code:

ssh [email protected]
Password >>   le

nano .kodi/userdata/advancedsettings.xml

Copy and Paste Example 4
CTRL-O to save  CTRL-X to exit
reboot

BTW, what's wrong with the Shield video playback. I've read some users are finding 4K video sync issues ?