Get a backup first, as this may end up requiring a reinstallation to remove what’s been installed.
Here, remove CleanMyMac, and remove MacKeeper, reboot, and see if your problems persist.
Removal of some add-on cleaners and some add-on anti-malware can sometimes be difficult, requiring a reinstallation of macOS.
Add-on anti-malware and add-on cleaner apps can and variously have reduced performance, corrupted data, and occasionally and very deliberately have collected and resold all of your web history specifically including your purchase history.
Quoting from some of what’s been published on MacKeeper: “In January 2014, a class action lawsuit was filed against Zeobit in Illinois.[38] The lawsuit alleged that "neither the free trial nor the full registered versions of MacKeeper performed any credible diagnostic testing" and reported that a consumer's Mac was in need of repair and was at-risk due to harmful error.[38] In May 2014 a lawsuit was filed against Zeobit in Pennsylvania, alleging that MacKeeper fakes security problems to deceive victims into paying for unneeded fixes.[39][10] On 10 August 2015, Zeobit settled a class action lawsuit against it for US$2 million.[40] Customers who bought MacKeeper before 8 July 2015 can apply to get a refund.[41]”