I made app and launched with using Xamarin.forms.

I'm wondering how I can profile my app and check memory allocation and leaks.
For now, (2016/12/2) iOS instruments not working for me. 
It's freezed at the beginning. (I already know freezing is normal behavior, but it's freezed and never come back)

Is this only happening to me? or you guys too?

And I also noticed there is Xamarin profiler. 
But is this paid program?

How can I check memory leaks?

Thanks.