Yes, let me qualify, Poloniex has had issues for at least three years from what I've been able to research. Those issues haven't been resolved, then you have hacker attacks, a huge flux of crypto newbes like me. So I figure poloniex platform is unstable right now. I stay away for now... and I will be careful with my coin on exchange wallets, I won't hold a lot of coin on exchanges, even though I had very little in my Poloniex wallet.