Keurig Mini Plus Failure - Design or Quality?

Keurig announced a major recall yesterday.

WATERBURY, Vt., Dec 23, 2014 (BUSINESS WIRE) -- After receiving reports of hot liquid escaping from MINI Plus Brewing System units during use, Keurig Green Mountain, Inc. (Keurig) contacted the U.S. Consumer Product Safety Commission (CPSC) and Health Canada to begin the process for a voluntary recall. The Company has received approximately 200 incident reports related to the approximately 7.2 million MINI Plus units in the U.S. and Canada, which equates to an incidence rate of approximately 0.003%.

Keurig States:

What Occurs?Hot liquid could escape from certain MINI Plus Brewing System units during use. Keurig has determined that this event is more likely to occur if the brewer is used to brew more than two cups in quick succession. Action RequiredPlease contact us immediately to obtain a free repair kit which resolves the potential issue.In the meantime, you can continue to use your brewer. We recommend you avoid brewing more than two cups in rapid succession and maintain an arm’s length distance from the brewer during the brewing process. 

The question is,what is the defect and is it design based or quality based?
Information available:

• Did the recall take too long?  CBS's Mike Lipka has an interesting report:
• Under federal law, companies are required to report to the U.S. Consumer Product Safety Commission when a product risks causing a serious injury. Generally speaking, a machine that sprays steaming hot water would appear to have that potential.
• Most recalls are issued without a single incident, let alone injury. Sometimes, there are a handful of problems -- enough to let a company know that reported issues with a product aren't flukes, but rather a possible defect. And then, every so often, a recall comes only after a great many problems have been reported.
• It looks like a fix was implemented in July 2014: 
• The systems being recalled are the MINI Plus Brewing System units with model number K10 (formerly identified as B31) produced prior to July 2014 

• Repair Kit Includes: (MoneyCNN) The kit will likely include "a brewer handle attachment and a replacement K-Cup holder which prevent hot water from escaping," spokeswoman Suzanne DuLong said.
• What is the purpose of the repair? What is the defect?
• The root causes of the problem are what?  Does anyone have information?  I will update as I find out.

Here is, perhaps, an unrelated complaint from Oct 2013.