I believe this problem is caused by the grounds and coffee "dust" flying everywhere when grinding. Combine the debris with hot water and steam and then it gets into all of the mechanical/moving parts and gums them up when the machine dries up again. It leaves a tar-like resin behind (yuck). This prevents the latch inside of the basket assembly from fully engaging and voila, the coffee-barf problem begins. I keep one of those cans of compressed air nearby and periodically "blast" out the left and right slides of the filter basket. I also blast out the grounds from the carafe lid/float. I use one of those cans normally used for dusting off electronics and it comes with a straw, which fits into the crevices nicely.This works best when the coffee maker is completely dried out. The grounds get into everything if you don't keep up with it, you will be surprised how much gunk gets into the parts. I found that using this coffee maker requires a bit of preventative maintenance, but it makes the best coffee for me and I wouldn't let these problems prevent me from buying this machine, by the way. Mine is about 5 years old and I use it every day. When I have coffee at other peoples' house, it tastes like ****. I always open the top cover and let everything dry out after brewing. Also, I wash all of the parts after every cycle and completely dry everything out before using again. I haven't had the problem with the door popping open during brewing anymore. Just remember to keep everything DRY!
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These tanks can't actually be overfilled since all water poured in displaces the exact same amount of water coming out the spout. So, whatever amount of water you pour in, will be the same amount of water that flows to your pot minus the amount absorbed by the coffee grounds and filter.
Your problems sounds like an undersized (Non Bunn) filter, or clogged brew basket. To verify this, try pouring in only half the water for your brew cycle and wait for it to finish dripping, then pour in the rest. If no overflow has occurred, you simply have the wrong type of filter. If overflow begins again, you have a clogged brew basket, since no Bunn can flow too fast for the brew basket to keep up with it.
This is because Bunn filters are manufactured differently than generic store bought paper filters. They will flow faster, brew cleaner and stand up better than normal generic filters. Remember, Bunn makes their OWN filters for good reason. They made the first, best paper filters for drip coffee pots, and all others are just generic dioxin gas producing paper.
Many folks have reported this, the latching mechanism wears out eventually. We had the problem but discovered that the door on the basket wasn't getting completely closed. Now I make sure it's closed and haven't had any problem since. Hope this solves your issue - if not, keep an eye on yard sales, we picked up two at different times for $5 and now have parts to swap out - not much help for a failed latch though. Glad I never paid full price for it, even though it's a fairly good grinder/brewer.
Open the reservoir lid. Remove the grinder
basket lid by using the recessed area on
each side of the lid. Then remove Grinder
Basket. Open Filter Basket Door. Remove
Filter Basket Cover, Filter Basket and Filter
The grinder basket, grinder basket lid, filter
basket and filter basket cover can be washed
in warm soapy water and rinsed thoroughly, or
cleaned in the upper rack of the dishwasher.
Dry all parts after every use.
COFFEE PREPARATION PROCEDURES
1) Place filter into brew basket.
2) Put the proper amount of coffee into the filter.
3) Slide the brew basket into holder.
4) Place empty decanter on warmer located directly under the brew basket and turn corresponding warmer switch ON.
5) Pour decanter of fresh water through pour-in opening at top of brewer.
6) Hot water will be delivered through the sprayhead. This distributes the hot water evenly over the coffee bed within the brew basket. The coffee will drain from brew basket into the container below.
7) Red light indicates warmer is ON.
8) Before brewing next pot, remove brew basket from brew rails and dump filter into waste basket.
I've read of this problem from other users of the newer Spacemakers and believe I know what's going on. Black & Decker used too strong a spring in the mechanisms involved in the "sneak a cup" feature which keeps the small tab or finger underneath the basket from opening and allowing the coffee to run into the decanter.
My suggestion would be to make certain that the tab that presses against the bottom of the basket is open when you insert the carafe. Not owning one of these units I can't state categorically that this will solve your problem, but all of the Spacemakers are fundamentally the same, just some cosmetic and design differences between them.
If it turns out that the tab is open when you go to bed and the basket still overflows it's possible the spring is so strong that it's moving the carafe away from the back of the unit, causing the tab to close against the basket. If that's the case I would figure out how to remove the spring without breaking anything in the process, then take it down to your local Ace Hardware and get a same sized but weaker spring. That should solve the problem permanently.
I had that problem a few times. When the door is open and the basket is removed I pushed in and held the release button while I cleaned that little hook area that holds the pop out tray in place. I just used a paper towel and nicely warm water. Works fine afterwords. I try to clean this at least every week.