No RF activity but working comms using XCTU

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we started to use the XBP24CZ7SIT-004 modules but we are experincing strange behavior - out of 10 modules 3 do not respond to any RF traffic - we have set them up in a ZIgbee Concentrator mode one by one and uploaded the same firmware and profile to the modules - 7 out of 10 modules work great but 3 do not receive any RF data - they communicate using uart using xctu but there is not rx RF traffic showing in the command window.

Is there a change the RF part of the module is fried or not working but the rest of the module is? Is there a way to debug this state?