besides more than 80% of the coins on YOBIT are dead. just check their wallets in your wallet tab and you will see they are all in "maintenance" which never ends.
I hope Yobit must do something about this "dead coins".I too have bought this, I ended up playing on Yobits dice game Unlike c-cex and Polo, they are delisting under performing altcoins. Its a good way to trim down those "shit coins", were sometimes they are called scam coins.
they don't care about these things to fix anything, they only care about the volume to come to their exchange. and honestly if it weren't because of their spam signature advertising all over the forum, they would have had zero volume to work with because there are many other good exchanges that are doing a nice job and have a good and responsive support, why would you choose yobit over them?!