Occasionally game doesn't respond to mouse inputs

While playing earlier, after buying packs with gold, I cam out to the main screen to open the packs and it showed 15 available to open. Fifteen is the amount I purchased. The card packs didn’t show up to be opened. When I backed out of the menu none of the game buttons responded when clicked with the mouse. I had to ctrl/alt/del and force closure of hearthstone and re-start the game.