Hello,
i don’t know if you’ve already tried this or if it can help at all.
I had the same problem and, thanks to this thread ( IOS crashing issue (severe) - #19 by guido_wikipoint ) I managed to avoid the memory leak on iOS devices by reducing the size of the model.
The tool I used, as kindly suggested by @guido_wikipoint 
, is https://rapidcompact.com/
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