I’ve recevied cPanel update error messages from server.

cpanel version change is blocked 

On most cPanel servers, /usr partition to often be the problem.

So check out these directories for large files:

/usr/local/apache/logs/archive

/usr/local/cpanel/logs/archive

These are two errors were large logs build up.

I’ve fixed the problem after clearning large files in archive directory.

If its not fixed, you may also check Apache domlogs.