Problems with W3TotalCache Plugin

Hello there,
I’m using this plugins in my websites (more than 20). This is the best plugin I ever heard. But unfortunately, we are facing issues on daily bases. Each and every day we have problems in 2-3 sites because of this plugins.

The site gets crashed due to Page Cache enabled.
.htaccess file automatically updates with the content that are not a legal ones and not required.

We did all the required settings in it. Will you please help us to find out any specific reason for the problems ?

Here you can take a look at the settings we made in our sites:
http://osdemo.drcinfotech.com:88/drcrmv/w3totalcache%20settings.png

Thank you in advance.

https://ww.wp.xz.cn/plugins/w3-total-cache/