zbook said:
A very large number of people use Ccleaner.
There is a part of Ccleaner that can cause problems: registry cleaning
We see problems with Ccleaner related to the use of this feature.
So we recommend using Ccleaner but not the registry cleaning.

For Iobit we see problems related to BSOD and overtime other problems including registry problems.
In general there is little benefit and more problems over time with the software.
In the forums we see problems so overtime there are some software that stand out more than others.
I know exactly what you are talking about

But the software is really doing a good job
my Pc is clean and free for a change