You are right tier 1 exchanges just don't restrict accounts out of the blue, there must be some illicit activity or bad transaction (means a transaction with bad AML) that has been made to your account, which tier 1 exchanges prohibit, and you (snowpega) should talk to their support and ask for help or at least some guidance on what is ongoing.
If you made a transaction or received a bad transaction, then record it to the exchange and tell them the reality otherwise as Omori said there are many possibilities for this.
Yes, Dear, I contacted the Exchange support that time; they said there will be nothing wrong with your account health, but when I received the recent payment, they opened another RFI request. In the first one, they just asked me from what services I am receiving the payments, but in this one, they are asking for the owner's name of the service provider and the owner's name of the address. Well, while replying to your post, I just noticed one more thing while checking the transaction history: both addresses are different, which is making it more complex for me to understand. Now, mate, what it is, haha, two different addresses from where I received the payment.
Other than that, I have PM'd the manager for this, but I did not mention in the PM that I am receiving the payments from two different addresses because I just came to know about it now while writing the post. Well, till then I am waiting for a response from the manager.