S7 Edge Problem

Hi I was wondering if anyone can help me. I have an s7 edge and I have started noticing that sometimes the notifications aren't coming through on my lock screen. For instance I have twitter notifications set up for when someone tweets and the majority of the time they alert me then show up on my lock screen but sometimes when I unlock my phone I'll have a few come through at the same time. It's as if sometimes when I lock my screen it disconnects from the Internet and when I unlock it everything is coming through. I also noticed something different today, I tapped my home button to unlock my phone and on the lock screen I had an alert but as I pressed the home button to wake up from sleep the exact same notification popped up again. So I got it twice but it was already on the screen then it alerted me again when I tapped it. Does anyone have any suggestions? Thanks

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