cant read 2006 lbz allison tcm

[mrrattle]

I have had two occurences now of not being able to read the lbz/lmm allison tcm. one unit is a medium duty the other a regular silverado.

Check status returns normal information.

when try to read the tcm efilive gets stuck at
initializing tcm,

status bar never moves, two leds on right of v2 interface a blinking

I have let sit for just over 5 minutes, hit the stop button
and get the normal message of data transfer interupted.

after several attempts the tcm data corrupts and efilive reports missing calibration. (have to reload using tech2)

I have the december 31 bbl updates installed.

any ideas?