I was having similar problems.
Note the name of the file that is being scanned when it hangs for a clue as to what is causing the problem.
Also check your Process Manager CPU usage and see if another process is contending against SAS. Once I saw something that was rising and falling in comparison to SAS, i.e., CPU usage was always 100%, so whenever SAS dropped some percentage points, the other process rose to pick up the slack so that CPU usage never dropped before 100%.
I was able to use a Quick Scan to get the scan to complete. One item was detected and cleaned with this method.
Then try a Complete Scan. You might try limiting it to Drive C: to start with.
I was also able to get it past the sticking point with a Safe Mode scan.
You can also try scanning with another product like MalwareBytes Anti-Malware first.