However, we also found its prlvmapp process often chewed up processor cycles like nobody's business, and for a short while we were worried our MacBook would melt, such was the strain Parallels.
I don't know where you determined you have a corrupted filesystem and need to use Disk Utility to repair it. Your computer runs hot when sleeping, most likely, because you have something running that does not stop during sleep. You should check what is going on with your third-party software. You also are straining RAM to the point where at times the system is using space on the disk drive to provide needed RAM via virtual memory which is very slow compared to regular RAM.
A Troubleshooting Procedure that may Fix Problems with macOS El Capitan or Later
You should try each, one at a time, then test to see if the problem is fixed before going on to the next.
Be sure to backup your files before proceeding if possible.
If none of the above helps then make an appointment at the Apple Genius Bar for service. If you need to find an Apple Store - Find a Store - Apple.