Lpc2000

Dear all,

 I've got my MB40 connected via a keyspan USB->Serial converter, I use this
for programming my AVRs and it works fine, everytime.
 But I'm having problems getting the code, consistantly, about 1 in every 6
times it works fine, the other 5 it gets part of the way through and stops,
says its lost the comms port.

  Anyone else had this problem?

Paul