yeah terracoin does that now, it has a difficulty readjustment algorhythm in place for high hashrate machines attacking it. such as asics. so if those macines attack, instead of it going out of service for 48 hours, it now divides its difficulty exponentially every 10 minutes it hasn't found a block..
that's the cause of the wild swings
Won't that just cause a shitload of stales and orphans?
I thought that's the reason Coinotron close down the TRC pool, pretty much all the blocks found by the pool was invalid. Furthermore, the person who is attacking the TRC chain for days now, is still using the time-travelling exploit via really high hashrate, hashing 30 blocks in secret and then dump them all at once every hour (the dump used to be every 15~30 minutes).