In that case, can you please provide some trace files...
In stand alone data logging - where it works, can you log data for about 10 seconds, then stop the log and save a *.xalm trace file directly from the V3 device. (Scan Tool -> F3: Scan Options -> F1: Save Trace File)
In pass-thu mode - where it fails, can you log data until the AEM has stopped sending data, then stop the log and save another *.xalm trace file directly from the V3 device - and save a *.htx trace file from the EFILive Control Panel.
Note: When saving the *.xalm files you have to save them before rebooting the V3 device (i.e. before unplugging from the vehicle).
Can you please create a support ticket here: https://service.efilive.com/new-ticket
and include those trace files.
Regards
Paul