Over flow grounds without a cause

I have had two of these machines (warranty return) and they both did the exact same thing. Here is what I have discovered the problem to be.

The lid for the carafe gets stick and internally jams. As another poster suggested clean it thoroughly (this sometimes works). I have another solution. Call 1-800-726-0190 and explain that you lid jams and leaks all over your counter. They will send you an new lid for free no questions asked. They obviously are very aware of this situation and don't even ask for proof of purchase or purchase date.

Guys just had this problem. Twice in the last two days flow of the coffee would hit a block somewhere and overflow spilling all over the counter. I held the screw-on lid under a slow stream of faucet water and was able to recreate the problem. The flow would not drip through the lid and only pooled up on top of the lid and then spilled over. I washed it under the faucet and even soaked it thinking there was a clogged valve. After being unsuccessful, I though it was a mechanical flap. That too proved unsuccessful. I then resolved the problem by sticking the tip of my shower Water Pik Dental flosser into the three holes on the top of the lid and into the drain hole at the bottom. It blasted out a clog of fine grains of coffee.
Works fine now. good as new.

Our solution is to NOT grind. we never have the problem when we don't grind. 6 cups, 8 cups, 12 cups. all works fine when we don't use the grinder. weird but true.

I just called the service number and they said they would sell me a replacement lid for 13.95!

We've had this problem and tracked it down to our occasional failure to push the karafe all the way in.  If it's not in fully, it won't push the switch that lets coffee flow from the filter into the karafe so the filter overflows.

Clean the top of the coffee pot every which way under water-grounds seem to get in and clog it up