Well, im glad some of you are having better luck than I have.
Another thing that's been tickin' me off about the DC30'S is the way they charge.
You have to sit there and play with the stupid thing for 10 minutes to get some of your collars charging.
Cleaning it sometimes is not enough!
I'll give you guys a little tip that has really helped me charge my collars lately.
Take your pocket knife out and (with a sharp edge) gently scrape the two power points on the dc30 itself. Works like a champ. just dont shave the metal off.

hope this helps you guys.