If there is trouble at Bitfinex, the stresses may have been increased considerably due to rapid withdrawals from the cold wallet during April. The cold wallet balance has been halved since then and might simply indicate trader jitters, but worries about Bitcoin exchanges have tended to be well-founded.
it is worth mentioning that all this so called "stress" is nothing but the fear of people because Bitfinex banks have blocked their fiat wire transfers and currently there are no other way of getting your money out of that place other than withdrawing Bitcoin (and obviously other cryptocurrencies).
i wouldn't call this "trader jitters"! it is a perfectly logical decision that traders make to get their money (in form of BTC) out and continue their trading elsewhere to be able to function normally.