Add a disclaimer when making a review to contact the developer if it's an issue
I think that on the page to write a review it could be helpful to say that if you are experiencing an issue with the app to try and contact the developer first before leaving a negative review, because the developer doesn't receive a notification of the review.
I was thinking something like:
If you are experiencing an issue with the app try to contact the developer first
the word contact
could also be a link to the app issue page.
On android users are used to report issues in the reviews because the developer is notified, but unfortunately here bug reports made this way are often lost.