I worked in a fabric store, and we sold Janome machines. Part of my job was to make sure all the machines ran satisfactorily. There are only a couple of reason I can think of that would make a bird's nest in the bobbin area. 1. The machine could be threaded incorrecty. 2. Something is wrong with the bobbin area. 3. Incorrect bobbin for that machine. 4. The tension needs to be adjusted. I hope this helped. Good luck.

I had a problem of that kind with my Viking, and come to find out, the needle was not inserted completely to the top. Now I hold the needle with a fingernail while I tighten the knob to secure it.

As Ben stated they are taking the machine in today. I hope they get the problem resolved. Hope he let's us know when it get's resolved.

Take it back to where you got it, and before they do anything with it - show them what it does for you. That way, they see what you are doing and can go from there. Take fabric and the thread you are currently trying to use with it.
I have a friend who was having issues with a different machine and they repair person just sat down by it and went, Oh here's the problem. She took it home and it did the same thing. So, make sure that you show them what is going on.
I have 3 Janomes and love them. One I have had for about 20 years and have had no problems with it.

I have the Janome 6600 and absolutely LOVE it. Many of my friends have it and the 6500 and love theirs, too. It is a good machine. I have owned Singer, Bernina, Pfaff and Viking and this is my favorite.

That said, even the best companies can put out a lemon. You might have one.

But, I suspect, like others have stated, that it is in the bobbin area or the threading.

Waiting to hear what happens at the shop when you take it in.

I have the 6600 also. I have had it for 3 yrs. I have never had a problem w/ my machine. That being said I've always used Gutterman, Molnlycke, & Aurifil thread. I was told when I purchased it to use better thread.

I've had my 6600 for several years. I have used Coats&Clark, as well as the threads from Connecting Threads, with no problems. I hope you can find out what is wrong. Check the tension first. Also, is the bobbin in correctly.

I have never have any trouble with mine, I have had mine for 6 yrs. mine will sew with any thread.

I have a Janome embroidery machine and have had nothing but trouble with it. Same problem, bird's nest underneath. There was always an excuse when I brought it in when it was under warranty. I asked for a new machine, but dealer refused. I searched on line and found that there are a lot of people having the same trouble with their Janome. I told my dealer what I had found out and he told me that Janome had that problem years and years ago, but it was corrected many years ago. We know that is not true. It seems people either love their Janome or hate it. When I went looking for a new sewing machine, the same dealer was very high on the 6600 and the Horizon, but there was no way I would consider a Janome, even with the great deal she was offering me on a 6600. I went with a big Brother and I am so glad I did.

I have a Janome and find like most machines they have the little quirks that can be very flustrating. Like I
have to have the thread arm in the up level when I stop the machine or next time I sew it will do the mix up
the thread over the bobbin. I like it and it sews wonderful. But all the little quirks are terrible to live with.

Flo in NNY