Why is my internet really slow all of the sudden?

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My internet connect so suddenly slowed down to the point that I can't even stream a simple video. I think something is wrong with my connection because only my laptop is having problems. Why I try streaming a video on another device it works just fine.

Also when I go to a Starbucks or somewhere else that has WiFi, I don't have the slow internet connection that I have at home. What could be causing this?

Here is what I have tried:

- Restarting my computer (A few times...)

- Turning off my modem and turning it back on (a few times...)

- Scanning for viruses (Found some with Avast but the were deleted)

- Scanning for male-ware (Found some but they were deleted)