Kraken Exchange is well-known as a US based prominent Bitcoin exchange operating in Canada, the EU, Japan, and the US, and "the world's largest Bitcoin exchange in euro volume and liquidity".
On December 15 the Kraken Team has published an message in the official blog stating that the exchange is undergoing an unexpected explosion in demand and due to that Kraken.com performance has become "extremely degraded and unreliable". Those problems has brought the necessity of a system upgrade.
Update on Degraded Service and Systems Upgrade: https://t.co/72UnQo1Mq8
— Kraken Exchange (@krakenfx) 15 December 2017
The major system upgrade which aims to resolve these scaling and load issues is stated to be launched next week. It was also stated in the announcement that the upgrade has been substantially delayed by the diversion of resources toward the protracted fire fighting effort required to deal with the unrelenting growth during last several months.
The Kraken Team has also claimed that the improvements of service quality will be made up during the upcoming weeks.