Time for another crackpot theory from yours truly. I have no idea how Amzn actually works, this is just based on my own experience and observing stories on this thread. It looks like Amazon send out the doc requests in batches of ASINs. Each batch has its own document due date and the requests are sent to some (not all) sellers for each ASIN. The thing is, the seller who gets the request may not have any inventory and may choose to ignore the request. If a due date has passed and no document is submitted, bots shut down the ASIN for everyone (including Amazon). They will check again on the due date of the next batch, if other sellers in that batch actually submit a document, then the bot reactivate ASIN, otherwise ASIN is dead.
Here is an example: say you, I, and 8 other sellers have ASIN X in our inventory. Amzn send request to me (batch A) with due date of 7/15 and a few weeks later send another request to you (batch B ) with a due date of 7/31. Say I actually do not have any inventory and decide to ignore the request. The bot checks on my due date (7/15) and sees no document has been submitted and shut down the ASIN X. You see the ASIN is gone and decide to submit some documents on 7/20. On your due date (7/31), the bot checks and sees a document for ASIN X and re-activate the ASIN. This explains how sometimes ASIN just magically re-appear.
If for whatever reason both of us do not submit any document, then the bot will just shut down the ASIN even though there are still 8 other sellers on it. If Redcell is one of the 8, he would just notice the ASIN is gone without any explanation.
Thoughts?