You have not indicated whether this is a recent issue or it has been that way since day one.
If it is a recent issue, do a system restore. Pick a date when you did NOT have such a problem as your restore point.
Open Win 8 > go to Charm Bar > select Start > anywhere in the window, type recovery > right side under the search box, click Recovery > click Open System Restore > click Next > select a date BEFORE this issue ( if you can't find a suitable date, click show more restore points ) > click Next