"SHIELD Experience upgrade 7.2.1 is a minor update addressing a few issues that have come up from the previous upgrade.
Bug Fixes • [EU] Resolves 5GHz Wi-Fi connection issues for SHIELD TV 2015 and SHIELD Pro models • Resolves port blocking issue with SmartThings on SHIELD • Fixes issues some issues where USB storage is not detected on active hubs • Removes erroneous error message when cancelling NAS connection attempt • Removes warning displayed incorrectly when connecting SHIELD TV mobile app to SHIELD
Known Issues • PS3 controllers not currently supported over wireless • Some issues playing .ts video files • Connection from PC to SHIELD folders limited to SMBv1 • Rare cases where system seems to hang on startup • "Full" dynamic range setting not working as expected (available under Display options when color mode is set to RGB) • Occasional audio loss on Kodi/SPMC, MrMC during HDMI hotplug • Issue with PUBG Mobile mouse accuracy • Color display accuracy issues on Chrome • Issue getting correct installation build on rooted/unclocked devices. Enable “Provide full system upgrades” in developer settings. • [SHIELD 2015 and SHIELD Pro] SD Card not recognized after 7.2 upgrade • Connection issues when mounting NAS to SHIELD • Rare occurrence where Hauppauge tuners would not be seen • Some 3rd party game controllers not functioning properly
We are actively working on known issues and expect to have an update soon. "
https://forums.geforce.com/default/topic/1090613/shield-tv/shield-experience-7-2-1-release/
both of my Shields have this freezing issue with NBA League pass but Mibox is ok . hopefully it fixes it