Q.Red tip photinia
I know that my red tips have a fungus that I have been treating but lately more than normal leaves have been falling off including green leaves. It looks like in my back yard. Is it possible for the shrubs to have another problem, or is it normal to loose a lot of leaves.
Yes, it's possible to have multiple issue with a stressed shrub or plant.
Make sure you are cleaning up any dropped leaves and plant material and disposing of, to prevent spread of any disease or fungus.
Here are some links with more information.