Yes. Yes. I tried to transact money from Poloniex to my Yobit account, but it has been sitting there for 120 hours now, waiting for confirmation. I placed a good transaction fee. In fact, it was 10% of the amount being transacted. It was much higher than the average fee set by BitcoinFees21. I haven't sent any support tickets yet, as the amount that I was transacting was not quite high (0.01BTC).

I am putting it down to rising mempools and picky miners. I don't know exactly what the cause is, but if someone could enlighten me, it would be great.