Transferring $ONE tokens / Exchange maintenance.

Hi All, this is my first post. I’ve followed for a while and I wanted to say what a healthy community this is. The question I have is more broadly around exchanges. I have $ONE in two exchanges, one being Binance. I had wanted to invest in some Harmony dapps and was going to transfer some $ONE tokens to the Harmony One wallet. When it says “withdraws are suspended” which over the past two days both Binance & a smaller exchange I use both have this message, what does this mean exactly? I assume it may mean given the trading volume has increased so much that they don’t want $ONE tokens transferred off of their exchange to protect their liquidity but that’s merely my guess - I actually have no idea! Some insight would be great! Thanks