Curiously Consistent Kodi Crashing

I have a problem whereby Kodi crashes with what might be called almost absolute consistency. Let’s say I put a movie on. I can pause it, restart it, watch it to the end. No problem. But then I can practically guarantee that Kodi will freeze. I am using Kodi 17.1 with the stock Estuary skin, on an Nvidia Shield media player. I will have to go to Menu, Settings, Apps, Kodi, Force Stop, then Start. Then I can watch another movie, TV episode etc. Then, when that episode has played – I have to go through the same procedure. View, Force Stop, Restart, Repeat. Sometimes I will get a freeze while doing something within the interface, but that it quite a bit rarer – for example, I can’t change the Weather units from Centigrade to Fahrenheit – that always produces a freeze (no pun intended).
Any ideas? I’ve kind of got used to doing things this way now, but it would be nice to not have this problem. By the way, I also have Kodi on a windows 10 PC, connected to the same NAS etc, and I have had absolutely no issues whatsoever with that setup. Only on the Shield.