There's a new update for this on the original tablet, not sure if its for the K1. Its ver 4.2
This update for SHIELD Tablet contains important system enhancements & bug fixes, including:
SHIELD Tablet now meets Android 6.0 Professional Audio requirements, including:
-Low Latency Audio (<20ms continuous round trip)
-USB Host & Peripheral modes
-24-bit@192kHz Stereo & 7.1 HDMI output
-MIDI support over USB & Bluetooth LE
Option to toggle Navigation Button location (Settings > Personalize Settings)
Enhancements & fixes to Vulkan™ API
Improvements to touch responsiveness
Fixes to WiFi & Bluetooth connectivity
Update to Android 6.0 Security Patch Level June 1, 2016
Overall stability and additional security improvements
*edit* For some reason it wouldn't install the incremental update so chose the full update and it installed. I lost root but that should be easy to fix.