Norton Security and Windows 10 Start Menu

Hello all

Since I've updated to Windows 10 I've noticed that sometimes after some hours of working the Start Menu not opens immediately, but only in some seconds after I push the button. Today I've collided with this issue again and instead of rebooting as always decided to try disabling NS, and it worked: the Start opened without any delays and keep working normally even after re-enabling protection. Is this the know bug and will it be corrected in future?

Sorry for my English))