
Hi,
1.Is there any changes made on windows 10? Like installing any patches or the antivirus software settings update?
2.Did you try to re-configure the customized icons again? For changing icon of shortcuts pinned t taskbar, you could right click the shortcut and choose the line above pin/unpin to task bar--properties---shortcut---change icon
3.To verify if this is related to third party tools, you could use cleanboot to disable some services.
https://support.microsoft.com/en-ph/help/929135/how-to-perform-a-clean-boot-in-windows
4.Is the computer domain joint? Kindly check if any GPO related have been applied.
Hope this helps and please help to accept as Answer if the response is useful.
Thanks,
Jenny