I was mining today and had reached 262 points when the mining stopped and then started and I lost 32 points. But I did not get back the bombs I used to get those points.
I have been finding it difficult to reach the required number of crystals and when I got to only needing 38 I lost 32.
When there is a glitz, like in mining you have to re battle but you don't lose extra battle points.
Also I had my Marionette dragon crafted and ready to put on te nest, when available but I lost That as well.