Big Problem options disappearing

I had a customer insert about 50 products with a simple option of size and they were all still there the next day, but they had to go back and add another option to each of the 50 products. When they had finished both the size option and the option they added were gone from all the products except the last one they edited. There were some products I had entered before then and these were unaffected, it was just the 50 that were inserted. I have been looking into every possible reason I can think of as to why they just disappeared, and I cannot figure it out. My customer has lost confidence in this project and telling him that I have no clue why the options just disappeared will only make things worse. All of the products affected by this were inserted within 24 hours of the problem, and the only one not affected was the last one entered. I highly doubt he went through and accidentally deleted all of the options from each product, and the hosting company has not been doing any changes or updates, the only thing i can think of is code somewhere that might cause this to happen.