I have a Mr. Coffee Keurig Single Serve Brewer (BVMCKG2-033) and I have only had it for 4 months (Christmas gift). It has been working fine until now. It will start brewing and then suddenly make a popping noise and then stop brewing. The brew light will flash for a few seconds and then it turns off on it's own. It only brews about a 1/2 inch of liquid. I can't even do a cleaning with vinegar as it will not pump the liquid through. Any ideas what I can do to try and fix this? Thanks, Stacey