No - Photinias should be putting on a lot of red, new growth at this time of year at the tips of the branches.
They are prone to leaf spot, powdery mildew,aphid attack and root weevils - so check for any signs of these first. In general, though, they are hardy shrubs suitable for most soils and conditions.
But, strangely enough, I went to visit a client of mine yesterday (I'm a qualified gardener) and exactly the same thing that has happened to yours has happened to hers - only she has almost no leaves at all now... very strange. I cannot see any bark or leaf disease, no fungal infections, no nasty bugs, no sight of anything unusual - it's flummoxed me!
The only thing I can suggest is that you leave it and see what happens in the next year or so, and in the meantime give it lots of water and a good thick mulch - although it has rained a lot in the last few weeks the weather overall has been quite dry over the last few years and if the Photinia has been in full sun all day it may be very dry. Many shrubs / trees do drop their leaves if they are stressed in some way, so don't give up yet. If, in next spring, no new leaves have appeared, then it may be time for the chop. If you do cut it down & dig it out, don;t plant another one in the same place or you may have a repeat of losing yet another one.