There are people playing underhanded to manipulate other coins. Quite a few of those people are afraid that the success of this coin will kill their little playground - the pure P&D scamcoins they use to drain the n00bz dry.
Expect to keep seeing them come in here to FUD in a desperate attempt to keep their external scams alive. They don't know how to trade in an open market with a natural coin, they only know how to social-engineer the weak-minded.
I believe in a few cases of the larger volume scamcoins, somebody paid to have the blockchain etc for SYS to be attacked repeatedly.
Somebody is very afraid of SYS succeeding.
It's stupid hard to follow anything. Fud out in full force. There's a lot of interest in beating syscoin down. It really just validates the claim that the chain was being attacked.