Because water can overheat and spray about, Keurig has recalled around 7 Million units in the USA and Canada.  The exact details are here: http://www.cpsc.gov/en/Recalls/2015/Keurig-Recalls-MINI-Plus-Brewing-Systems/  See if you have one of the models effected.

Consumers are instructed to contact Keurig for free repair.

Source: http://www.cpsc.gov/en/Recalls/2015/Keurig-Recalls-MINI-Plus-Brewing-Systems/