My balance was over 200k and now it is showing as negative and nothing is in reserve

All of a sudden, I'm seeing a negative balance in my account. They claim it's due to charges on my account but I call BS. Since when do you make my balance negative instead of taking it out of account level reserve? Makes no sense that you can make all these changes and when I question as to why you do them, you act like nothing is wrong. Selling on Amazon is becoming a dying trend, starting to not even be worth all the hassle.

Amazon shows that I have an upcoming payment but also shows that I have a negative balance due to returns and deferred payments. I've had 0 sales in 5 days, which is unusual. Am I losing the buy box because of the negative balance? I googled this question and here are the results. Is this true?

"No, Amazon will not give the Buy Box to a seller with a negative balance on their account. A negative balance means the seller owes Amazon money, which can lead to account suspension, payment withholding, and legal action"