After windows 10 security update KB3119147 Slimbrowser keep crashing when playing Flash Player Video stream:

(KB3132372): Beveiligingsupdate voor Internet Explorer Flash Player voor Windows 10 Version 1511 voor x64-systemen

remove security update: see this page: Remove Specific KB Updates Windows

Disable automatic updates Windows 10: see this page: How to Enable or Disable Automatic Updates for Windows Update in Windows 10