Unable to select Item, Size or see Pricet

After scrolling and selecting an Item such as a certain type or shoe or shirt it take to the next page where is goes into more detail about that item.  For some reason I am then unable to select a size. color or put the item in the cart.  It is just not there at all and it is not because it is "Sold Out".  It does it on every page.  I have restarted my PC thinking it was a problem on my end and it may still be.  After it restarts the pages work normally for awhile then the problem pops up again.