I know this has been asked time and again, but most questions and answers are years old and I have not yet seen any solutions that work, or any real explanations for that matter.

I have an app on Google Play which has been working fine the past four years. Today I went to Google Play Store on my computer and was terrified when I saw that it says "This app is not compatible with any of your devices"! Clicking the "Buy" button showed me a dialog where all my devices where gray and it showed me that the permissions of my app included that it could access media, photos, etc. 

WRITE_EXTERNAL_STORAGE

Even stranger is when I look at the app in the Google Play Store app on a device, it says nothing about it being incompatible. I have not seen any dramatic decline in new users either, so I have hope that it's "just" something wrong with Google Play detecting that I'm logged in to the developers account while visiting the Play Store. Even so, it's a very confusing error message!

Has anyone else experienced this and been able to resolve it? Should I be worried? Should I contact Google (like they'll actually read any feedback)?

At this point I'm just happy it doesn't seem to affect my app sales, but either way I would like to know the cause of the problem.

My registered devices on Google Play include a Samsung Galaxy S5, Google Nexus One, Motorola Moto G and Lenovo A7600 Tablet.