A friend of mine had the same problem. It ended up being the rivet on which the front truck spring is attached was too long and hitting the center rail. Look for something that could be shorting out by hitting the center rail.
When you block a person, they can no longer invite you to a private message or post to your profile wall. Replies and comments they make will be collapsed/hidden by default. Finally, you'll never receive email notifications about content they create or likes they designate for your content.
Note: if you proceed, you will no longer be following .