Thank you so much! I actually looked around a little bit more after posting and saw someone else had a similar problem and they fixed it by changing the preview quality. That seemed to do the trick, as well. 🙂 But I notice it does seem to keep occurring every once in awhile.
I tried the toggle thing as well. As soon as I did that, the preview quality got pretty grainy/fuzzy.. not sure why though.
Thanks for your help!