Why, when I'm using a lot of ram, does my SD card randomly stop working for a period of time?

I like listening to music when I'm doing things. When I play Minecraft, and I suddenly find myself in a large world, modpack or LAN server, once in a while it's as if my Micro SD card has popped out of it's adaptor. I know that it isn't a physical case of having a bad adaptor, because when I pause my game and check my SD, my Computer gives me the notification that I have an SD card in my computer. I've tried removing everything around it that could affect it. Usually this wouldn't concern me too much, but my micro SD has all my music on it, and when it pops out groove stops working, and I have to start the song again. A bit annoying when it's only 1 minute's time in between.

System Details:

16GB SanDisk microSDHC card

3 1/2 year old Lenovo IdeaPad U510 w/ 3.88GB usable RAM

Has a broken USB port (not sure if that's relevant)

231 GB SSD (not sure what company)

Runs lastest windows 10

Has had several Viruses before.

Rebooted twice, each time losing all my data.

Modpack: Hermitpack

Map (on multiplayer): Soulbound (played for a few hours)

Tell me if you need to know anything else

Why does this happen? How can I fix it?