I've recently started seeing these issues, there is a very simple routine 
that triggers 8-9 async get's and then calls .get_result's on them

It seems a deadlock occurs on one of the(?) items and for some reason the 
.get_result fails on that item, for that instance, persistently, for 1+ 
minutes

I'm guessing this could be related to an issue of ndb's instance caches

This happens to my app's users on signup, very frequently, I'm losing users 
since all they see are errors on signup (The routine is an on-signup 
routine, so when it fails, it's triggered again on every visit/request, 
which probably causes the issue)

Spamming an instance with the same .get_async / .get_result routines might 
trigger/reproduce the issue

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