Does facebook randomly delete friends?

[M.]

Ok there is 3 ways thats possible.
1. If you have siblings, check with them, they might access your computer and delete friends,

2. go to your Facebook homepage, click on settings(upper right corner), then go to "privacy settings", then to security, there click on "active sessions". there will be a list with addresses, IF all the addresses are your's then there is no problem, but if there are addresses that you dont know, then someone has been accessing your facebook. CHANGE password.

3. If your friend personally deleted you.

I am quite sure facebook has better things to do that delete friends.