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CC2640R2F: FCC test mode trouble with BLE5 stack

Part Number: CC2640R2F

Hello,

we are using the CC2640R2F on the LAUNCHPAD and trying to execute the FCC test mode.

The FCC did already work with the BLE4.2 stack. This week we switched to the new stack.

When we are trying to call  HCI_EXT_ModemTestTxCmd(cwMode, txFreq) or HCI_EXT_EndModemTestCmd() the software goes into the ROM_Spinlock( void ).

Do you have an idea what changings from BLE4.2 to BLE5 stack could cause this fault and how can this be fixed?