Not receiving notifications or able to enter some apps on my iphone because network problems?

Recently, i haven't been able to go into some apps due to network issues. At moments, I'm able to. I can go to safari and it can go slow or normally.

I've taken the plug out of the router and placed it back in, turned off my Wi-Fi connection on the iphone.

I don't know what do do…

When i was connected to the Wi-Fi at my school, everything went normally--received notifications and was able to msg as normal.

Get new router

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