FBA ASINs suddenly became Unfilliable

Yesterday all stock of two of my FBA ASINs suddenly became Unfilliable. I’m struggling to understand why! I have run an Inventory adjustment reports it show ‘P’ Inventory Disposition Change – What does this mean?

Amazon is suggesting restocking the item through recommendations, I haven’t received any performance notifications.

Answer: This has happened to me before and I didn’t understand it. I ended up just removing all of them and had a shipment of new stock sent in at the same time. I still have no idea how and why it happened, seller support were useless. After a short while I realised that just removing everything and sending in a new shipment at the same time as the only way to get my listing available again ASAP. It wasted funds and the ASIN was unavailable for a few days but this did fix it. I still have no reason or explanation for it. Unless there’s a categorical reason, you may just want to be fast in removing/sending stock just to minimise damage done to BSR