Mine has over 15 million stitches. Check your warranty. It should tell you how often your machine needs to be serviced. I take my Innov-is4000D in every 3 million stitches or once a year. The 15 million stitches have been put on in three years. My dealer just told me that I have just gotten my machine broken in. It should be good for another 110 million stitches. That made me feel real good.

I put 3 million stitches on my 780D in a year - never a problem with it freezing. My Quattro did freeze recently with only 1 million stitches but it had nothing to do with the stitch count - it just needed to be oiled. I get mine serviced every year. There is a service stitch count that is reset by the dealer when it is serviced = it just shows how long ago it was serviced - there is no magic number where it stops working. The total stitch count can't be reset by anyone - it is the number of stitches on the machine since day 1. You would want to get it serviced once a year or if it starts acting funny and makes funny noises, etc. My dealer said 3 million stitches in a year is not a huge number.

Mine keeps track of the hours of use not the stitch count. Most companies do say that they are not meant to be used for a business. It could cancel the warrenty. Read the fine print!

My 4000d has 2.8 million total, and about 38,000 on the service count. It was serviced a few weeks ago, and I've only done a few designs since getting it back.