You can try to root your device through 'Accessibility Options' then install Catlog from Google Play.
Run it then change the resolution to 1080p@60hz and upload the complete log to a file.
Then restart the device and also get a catlog.
Maybe it will show if the setting isn't saved and the problem can be identified.
There were several changes to HDMI & video drivers so something might work differently now then from v1.5 firmware.
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