We are using Apppresser to develop our apps. We have one app that has intermediate delivery issues with PUSH notices.

If you don't use the app you don't get notices. If you open the app on a Monday (for example) and  a PUSH notice is sent the next Friday (4 days later) you'd get it. If it's been 2 weeks or more then you will not get the notice. APPS are NOT set to sleep mode and this happens on both android and IOS systems. Apppresser seems to be as confused with the problem as we are. I'm a  newbie so I really don't know where to check  for errors. All error logs and the firebase server show everything is fine. Thank you for any help.....