We have purchased ~20 FMC110 boards over the last 2 years. They are mated to an ML605 in a small sensor. Most of the boards work quite well, but some, especially those purchased more recently exhibit erratic behavior - they will frequently put out many very high signals, sometimes full scale, spaced randomly but in the 5-10 usec range. Sometimes a power cycle will stop the behavior but sometimes it won't. Each power cycle re-configures the board exactly as your reference design and goes through the calibration sequence to find the correct delay for each bit. Frequently, a check of the calibration results shows 1 of the channels failing, almost always channel 1 which is the channel with the erratic behavior. Do you have any thought or suggestions which might help us with this issue? I am attaching a plot of the output of one of the boards with erratic output.