Losing restore points

Avast Free Antivirus / Premium Security
1

Hi
Did a clean instal of version 2015.10.3.2223. Uninstalled by using add remove, then used avastclear in safe mode.

Also did a custom instal and the only thing I did not instal was cleaner, ( unticked it)

Started with 10 restore points before updated avast, when checked only 5 left.
Put in a manual restore point rebooted now done to 2.
Before this version no problems with restore points disappearing.

2

I went into Avast set up in control panel, unticked Secure Virtual Machines and now I have done quite a few restore points and have rebooted several time.

Not just leaving the last 2 restore points.
Did not have (Secure Virtual Machines) ticked in previous version.