Dying box hedge

I planted about 12 box hedges last September. They seemed to be doing ok, but in the last couple of months, 2 of the plants have just turned yellow and withered. Any ideas what might have caused this?

 

I would dig them up and have a look at the roots. Box will strike quite easily so you could take some cuttings. I grow privet myself another easy but quicker growing hedge.

 

It may be box blight Tony but I'm sorry, I know very little about this plant or the disease, perhaps @Lolimac can help you with this as I know she has box.

 

I also think it has to be something to do with the roots or something in that particular planting hole,but what...

I had the very same problem ,it was just one plant and it went exactly the same.I replaced it in early spring but now this one is going the same way by the looks of it.The plants at either side aren't affected so it's a bit of a mystery ...I was thinking of trying to remove as much soil as I can in that spot and replacing it but it will be difficult not disturb it's neighbours roots...