CleanMyMac: Buyer Beware
I'm extremely frustrated with CleanMyMac. About a week ago, I started having issues whereby powering up my peripheral hard drives were causing my iMac to freeze and restart. I'm a professional photographer and all of my images are on my external hard drives so it's been incredibly disruptive not to be able to access my images. I purchased new Thunderbolt cables, spent long conversations with AppleCare, and began systematically disabling all my extensions and plug-ins, and uninstalling all my third-party software including Photoshop and Lightroom. It was very very time-consuming. I even tried to use CleanMyMac to get to the bottom of it. Finally, I decided to uninstall CleanMyMac, and lo and behold my peripherals are working again. This is a serious flaw in the software. Once Apple deduced that it wasn't a hardware or operating system error by booting up my computer in safe mode, they said the only way to figure out what was causing the issue was to uninstall my software one by one and keep testing it, which I did, but I lost days of productivity in the process. I was actually ready to buy a new computer thinking my thunderbolt ports have been fried. If your computer suddenly starts repeatedly restarting (what I'm told is called kernel panic), this might be your issue as well.
iMac 27″, macOS 10.15