Test of BG96 with R&S CMW290 fails with "UL sync error"

For final certification, we perform test of BG96 with R&S CMW290 base station simulator.
The BG96 has inserted the SIM card for the tester. Connection from BG96 to tester CMW290 is established at Band 3 with LET Cat M1 and the tester starts upload. Data is transferred for 30 seconds with 20dBm, then power sinks to -11dBm and connection closes.In the log, the message “UL sync error” is present.

Any ideas why the test stopps?
Are there special configuration required to do this test? Or have I miss configured the BG96?

Hi, I have the same Problem here. Do you solved this in the meantime?