Over 5+ years experience with 100+ website up and running. We have helped many of my clients fixing issues with WordPress.
Please note this is 1 issue per Hourlie.
* The White Screen of Death
*500 Internal Server Error
*Error Establishing Database Connection
*Connection Timed Out
*Maintenance Mode Following Upgrade
*You Make Changes and Nothing Happens
*Pretty Permalinks 404 and Images not Working
*Custom Post Type 404 Errors
*Call to undefined function
*Allowed memory size exhausted
*Maximum execution time exceeded
*Parse errors (Syntax Error, Unexpected etc..)
And many more.