Same issue here - I have 9 cameras, different models, push notifications are either non-existent or severely delayed the last week-ish here. At times the push notifications get unchecked in the app too, which was an issue in the past and easily fixed, but now nothing. The lack of sound notification has been missing for some time though, a couple months at least. You would think this issue would be more obvious to D-Link. I realize they may be more responsive to phone support calls, but I work nights, for example, and email is much more convenient. I've received no response from the company and I am beginning to become very disappointed.
