Hello Don,
If you go on the web and search "blade 400 ESC" you will see that there is an inherent problem with the ESCs and many guys are having the same problem you have and they give you some remedies!
http://geekozoid.blogspot.com/2009/0...early.html?m=1
http://m.rc.runryder.com/helicopter/t594405p1/
Hope this helps you, JPEE