Tuner no longer available

17 Beta 7

I got npvr working great natively and on windows + kodi but want to use my shield instead.

The problem I am having is when I change channel on the shield I get a no tuner available error some of the time both with timeshift enabled and disabled.

Looks as though it is specific to android + nextpvr.

Any ideas?
https://1drv.ms/f/s!AuJa556r5K_eiXeMDzGGIzYLymoA

Its seems to be mainly when changing channels by pressing the numbers directly rather than navigating the guide.