My servers were experiencing the same problems this morning on C78 (CentOS 3.3). I updated cPanel to C81 and this appears to solve the problem.
As I read through this thread, it appears that the actual problem was ignored, and a lot of unacceptable solutions were given by other members. This forum is slowly going to **** because a lot of members think they have something to say, but none of it is productive or useful.
Updating to Edge is hardly acceptable on many servers, and downgrading to stable isn't a solution to a real problem. I'm sure that the people who posted in this thread wanted real solutions to the problem being addressed...