In February we had to update our game from Unity 5.3 to 5.4 beta because of this exact same issue:
https://fogbugz.unity3d.com/default.asp?807926_6l3prd3kh0ldolol
where it was fixed, so upgrading Unity seemed as the easiest solution because the final release date was only weeks away. Nobody could knew back then that 4 months later we are still waiting for a stable release.
But time is running out and we are now facing a major release of a big project. At the moment we are using 5.4.0b12 which is working fine for iOS but not for Android where it crashes on most devices at startup.
The fix for these crashes were released in b18 but since this version the Animation bug posted above was reintroduced so we are in kind of a dilemma right now…
Besides that we are still facing this bugs which I reported a long time ago:
https://fogbugz.unity3d.com/default.asp?792875_r6osubg3s4vjkqcu
but even in the newest b23 it is not fixed!
So this is my last hope these bugs will be fixed asap. I’ll keep my fingers crossed!