Sometimes, my servers get deleted.

In the Minecraft Multiplayer Menu, I have found that my servers get randomly deleted from the list, and I have to re-add them manually every time this happens. It's not common, maybe once a week, but it still gets pretty annoying.

How to reproduce:

• Although to me it seemed random, I have found that clicking the 'Refresh' button repeatedly does sometimes cause the bug.
• It mostly happens when some servers that are online don't appear online on my server list (it says "Can't reach server")