Account threats? Would you mind to expound on that a bit?
Some authors hire people to borrow their books. This inflates their page reads with the borrowing system and earns them more money. Due to this, Amazon tracks readers with suspicious borrowing activity and bans authors who have a book borrowed by them. The problem being that it looks like these accounts also borrow other books (top theory is as an attempt to cover up what they're doing). Which means Amazon ends up banning a lot of people who had nothing to do with it, though there are often cycles of certain genres being targeted.
The only way to avoid this is to not be in KDP Select so that your book can't be borrowed. If you are in KDP Select, your account could be terminated at any time. You won't know it's happening until it does. Some authors have managed to get their accounts back. Some haven't.
rwm4768, I randomly check on your blog to see how you're doing every now and then (just like this thread) and saw your post about depression. Hope everything is going better now. It's easy to get caught up in worrying about sales and forget to have fun with the art. I hope you are in a better place now.
Congratulations!
'Not huge' is all relative - if it's a good month for you then that is huge, and every single sale is someone interested enough to spend money/time on your work. I've got Empire of Chains downloaded and I'll give it a read as soon as I have the time. Your covers are absolutely gorgeous too, by the way.
Pretty cool cover for Winds of Time (just checked your blog).