Push notifications stopped again yesterday on all cameras, IOS 11.2.6.  Did the usual, reboot cameras, reboot phone, turn off/on notifications.  
Same as two weeks ago.  Got a call from support then saying to delete the app and reinstall.  That fixed it on all phones.  Did that this time, no success. Obviously there's a bug with mydlink lite and ios that entered maybe in the last update 3.8.5?  Shouldn't have to delete the app to fix a problem.  Happening regularly now.  
I installed the new app mydink Home and it works, sending push notifications.  Are they migrating to this one?