Whenever I plug into the USB 3.0 it just writes non stop. I don't know what the problem is. Could it be the enclosure??? Is the lack of USB speed going to make a noticeable difference in gaming? Any ideas why this could be happening?
Try looking at the system's messages when you plug in the drive, by running dmesg -w (CTRL+C to interrupt) on the console and see if any errors are displayed.
Make sure you've updated your system (sudo apt update && sudo full-upgrade) to get the latest stable USB firmware and kernel/firmware release.
There's a sticky topic in the RPI forums here for troubleshooting problematic USB3 SSDs, you might want to take a look and see if your enclosure's USB SSD adapter could be one of the models reported with issues.