You have some software installed that is causing problems. When I say it is installed, it appears it was partially uninstalled however bits and pieces were left behind which is very likely the cause of your problems.
You may have been advised about this already but NEVER EVER install third party:
- Antivirus apps
- Security apps
- Cleaning apps
- VPN apps
- Maintenance apps
What I have found is you have
- Bitdefender
- Mcafee.McAfeeSafariHost
- WebrootSecureAnywhere
- (NOTE THERE MAY EVEN BE MORE THAT I MAY HAVE MISSED)
Installing these types of apps have the opposite effects that users want. They may Mac OS slow, appear buggy (much like you are experiencing) and unstable. Mac OS does not require nor does it benefit from any of the types of apps mentioned in my list. All Mac OS needs in order to stay safe, stable and secure is to be kept up to date and to restart the computer about 1x per week. Other than that please leave it alone.
My suggestion your is case because your system is quite a mess, is to start over by doing an erase (meaning EVERYTHING is erased) and then reinstall Mac OS and then restore your data files. Then manually install any third party apps and your system should become stable again.
To be honest I would probably take the computer to your local Apple Authorized Service Provider and ask them to do this for you.
If you want to tackle this yourself you can however please ensure you have a good backup of all your data files and that your system has a Recovery Partition so you can do the erase and install. It appears you had the computer upgraded at some point by adding a Samsung internal SSD and I'm not positive a Recovery Partition is there, it very well may be but I can't tell for sure which why you need to check. When you restore do NOT re-install your settings, as those are likely corrupt from the apps you had installed. Manually re-do your settings to your preferences.
Good luck!