My server list often clears its self

What I expected to happen was...:
I expect to open my multiplayer and see the servers I enjoy playing on

What actually happened was...:
I would open Minecraft, click multiplayer, join a server, play around, exit server, and not see any servers.

Steps to Reproduce:
Well. Normally It would happen were I exit a server and then the list clears its self. Sometimes it happens were I click the refresh button and it clears its self (I click the refresh button often and normally nothing bad happens). Every once in a while it happens when I first open Minecraft.

Extra info
This bug happens around once every 3-15 days. I normally have around 7 servers on my server list. I'm often to lazy to add them all back in though.