In my case, the ADB command didn't totally fix it. It has improved, but I still get delayed notifications after longer periods of not using my phone, like an hour or so. This is very annoying, I can't just leave my phone there and rely on it. I have to keep checking for important notifications like Gmail, for example. It's good to know that it's probably not related to the Google account, at least. I wouldn't want to be making another account just for this. Thanks for creating that petition, already signed it. I'm certainly considering another brand for my next phone.
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Thanks for the info! And do your other Android devices have Marshmallow or above? I started having this issue a couple of months ago on my Note 4, which had been on Marshmallow for a long time already. I think it started happening after some security patches that were stuck and came through this year after I did a factory reset. I was using a ROM made for another model of Note 4, by the way, but had never had problems. So, I recently switched to an S7. Some details: I'm using the original stock ROM without any changes, but I'm on a different network than the phone's original network. Unfortunately, the same issue persists :(. I just did the ADB command like an hour ago, I hope it fixes it. I was just wondering if it could maybe somehow be related to the specific Google account, since someome mentioned that possibility on Reddit, but if all your Android devices are at least on Marshmallow and using the same Google account, but don't show this behavior, it may not have anything to do with a specific account. Instead it's either a problem limited to Samsung or just more prominent on Samsung, I guess. Either way, it sucks that it's still happening to you after these months. I honestly hope that I don't suffer from this when I change to another manufacturer. (Sorry for the lengthy reply!)
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