The sound stops and freezes iMac

Regards
For some time my iMac stops playing sounds, such as iTunes, games and movies. When that happens, the computer freezes momentarily, which is annoying.
I noticed that the problem seems to be software, not hardware, but I'm not clear what will be, because I do not notice anything strange in Activity Monitor or when Disk Utility repair permissions.
Any idea or solution for this case?

Back up all data before making any changes.
If you've installed something called "Memory Clean" or any other third-party software that is supposed to "clean" or "purge" memory automatically, remove it according to the developer's instructions and reboot. You should do that even if the software is not causing the problem, because it's useless.
If you've installed an equalizer called "Boom" or anything similar, update or delete it and reboot.
If there's no improvement, or if you're not aware of having installed anything that fits the description, post again.

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