Android Push notifications stopped arriving

Hi, I really like the concept of this app and at first it was working great for me.
Lately I noticed that I don't receive my notifications anymore (Android push). The important emails do get into the AF Inbox, but my phone is not telling me about them. Which is kind of the whole point of the app. Once I restarted the phone, alters came back for a while and now I'm not getting them again. I would really want to trust the app and be sure that I'm not missing the important emails. Please help.
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