Danone plain low fat yoghurt 175ml

Our household have been buying Danone plain yoghurt for years and we each have one 175ml per day. We buy in bulk ( 10-15 ) at a time. The last two batches BB 27/4/15 and 7/5/15 we had to dump, as the quality is unacceptable. The product is not smooth anymore but comes out in a \blob"like a set yoghurt with water on top.It seems that there is too much stabilisers or gelatin in the product. We bought product from Checkers Hyper"