I experience the exact same behavior. Once price movement gets heavy, it starts lagging and then ... site becomes inaccessible.
After heavy price movement is over, site becomes accessible again.
And exactly this lets many of us think twice about the officially reason given (DDoS).
Whatever it is, I am sure tech staff is working to resolve it. Why? Because it's a normal thing to do for professional folks at Kraken.
After all, Kraken's reputation is at stake here.

Problems happen, but it's the way how to deal with / solve them, which sets a company apart from the rest.


Release the Kraken !
Cheers