Listings made inactive

I am still able to access the previous listing format, which I am still using. When checking for inactive listings I have found 23 of my listings have been made inactive today for no apparent reason. I still have all the books and patterns and there is nothing in account health to give any indication of why this has happened. Can anyone shed any light on what might be responsible for this. I did get an email from Amazon earlier on in the week suggesting that some of my products would be suitable for fulfilment by Amazon so I don't know if this is linked. I have absolutely no intention of sending any stock to Amazon