There are people using modified Paccoin wallets that are causing the syncing problems. Cryptopia and Yobit are down at this time because of this, but Tradesatoshi is up.
The user breakcrypto stated that a modification he supports would fix certain issues. I evaluated it, and decided against his proposal because it causes unlimited forks. This is the reason why the exchanges went down is because somebody is using his code to mine paccoins on a fork, I don't know why they would do this, you cannot send paccoins mined on a fork to the exchanges.
I've noticed my windows wallets are jumping in and out of sync. I am notififying the paccoin community to be wary of the proposed "updates" as they don't fix the coin, but as his name says, they break it.

Bill Corless
The Original Paccoin Developer