Amazon Buy Box lost what sellers should check first

Losing the Buy Box can make a normal sales day look broken, and the first reaction is usually to drop the price. I do not start there anymore. Price matters, but I have seen offers lose the box because delivery promise slipped, FBA inventory ran thin, the seller rating dipped, or a repricer kept chasing a competitor into a margin that made no sense. When the Buy Box disappears, I check the offer…