Continuously scanning and it won’t stop. ???

I seem to have this challenge at least every other day and I’m not sure why it happens, if I am doing something, or I’ve got a bug?
1.) How do you get it to stop? (without turning off the computer) I have tried the stop button and the pause and neither of them work/stop it.
2.) This happen when I scan the C-Drive or the “My Computer” Scan. But it does not happen EVERY time.
Any help would be greatly appreciated.
Thank you,