I've had this issue as well, but it usually happens when I'm idle or typing.
This also happened to me on my iPad Mini, but it was likely because it was an outdated device, so I bought an LG GPad F2 (mostly because it runs Android Nougat) and it's been a meager experience.
The game itself runs really nicely, I don't think I have had a lag spike in awhile now (I also have 30-50 ping). I still encounter crashes without a true reason though.
(totally didn't buy a new device just so the admins wouldn't say 'well maybe you're playing on an older device lol n00b')