I keep losing my buy-box randomly

As the tittle suggests, I just keep losing the buy box! I have my own brand in Lawn_and_gardening and its doing fine if not the best!

But I keep losing the buy boxes of few Zip codes time and again!! Its weird and amazon seller support is just handing me out random information that is completely irrelevant with 3 new links to random internal pages!

Since I am the only seller and whatever the price is there is lowest, it should ideally be buy-box eligible, I have 100% featured offer too but the listing just keeps disappearing from buyers portal while still showing active on my sellers portal.

The listing was ranked on the first page organically and had “Amazon’s Choice” for 3 of the keywords in its category, but it totally disappeared from few Zip Codes, Has anyone faced this? Do I just have to sit and wait? What can I do?