As we are aware Steem has been in and out of maintenance with withdrawal issues the last month.
The list of coins that are currently having maintenance or issues are :
bytecoin
bitmark
burst
gnosis
golem
lisk
nexus
riecoin
sbd
steem.- yours truly and always
vcash
zcash
Confidence with Yobit given the above coins are in retard mode, is low, I no longer use Yobit.