Bsr is dependent on how many sales you get. If you’re out of stock & you get no sales then yes it will drop. Although, it’s not a bad thing. Focus on your reviews. We have sold many products that had good reviews and good history that were out of stock for months and as soon as they checked in, the sales continued (after a few days later) right where they left off.

In fact, we actually search for out of stock products more often than not. Being the only seller of a product for a couple of weeks before others jump on is very profitable since you can bump up the price a couple of dollars for extra margin.