I just wondered if anyone else had experienced issues with delayed/late push notifications? I'm currently having severe issues on mobile data and some issues albeit less noticeable on wifi.
The main issue seems to arise after the phone has been locked for around 3 mins, once this time has passed notifications longer come through on time. It can be up to half an hour or more before they arrive. Sometimes unlocking the phone brings them through, other times I have to go into the app itself to trigger them.
I've also tried wiping the cache partition and doing a full factory reset. I've even had a Samsung Star login to my note 9 and check my settings.
If anyone has any clue how to solve this issue I'd be so grateful.
I think this problem could be related to the Mobile network you use.
I switched from 3, which has provided instant push notifications, to Virgin Mobile (who use the EE network).
On Virgin Mobile my push notifications are significantly delayed in the same way mentioned. All of the settings on my Note 9 have remained the same.
I have compared this with two of my colleague's Note 9's on 3 and VM, and the one on VM gets delayed push notifications whilst the one on 3 receives them instantly. This matches exactly what I experienced myself, and is why I believe it is a problem with the network provider.
I think you're actually correct. I've been doing non-stop testing on my Note 9. I'm currently on Tesco Mobile which has the issue, I've also tried my Dad's plusnet sim card which again has the same problem.
However: EE, Vodafone and 3 all work properly.
I ran a network monitor on my phone and when on Tesco Mobile it showed the connection going to sleep, it only woke up when I unlocked the phone, however on EE, Voda, 3 it constantly woke and then went back to sleep so therefore checking the network for notifications.
I wonder if MVNO's are the actual cause? I can say though that I've been with Tesco for over 3 years and this issue only started in around July/August this year on my iphone 6. I also had a similar issue on a Oneplus 6.