I have the same problem here, it started some hours ago, i already contacted their support but no answer by now.
I experienced the same.
But i discovered than during last 2 days my bot sended "ticker" requests every 1 second (or even 2 times per second)
Fixed now.
May be they just changed parameters of anti-DDOS system for "programmers with not straight hands"?
Now i can send one request, but after that any others cause "incapsula incident".
When i waiting about 15 minutes - one request is allowed again.
On BTC-e, when API-cloud ban you for overloading, you have just to wait about 1 hour.
May be here is the same?
Who know, how long "auto-ban" stays?
Wrote to support about 5 hours ago - no answer yet.