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The signal displayed on the QT GUI Frequency/Time Sink is stopped when there is an FMComms2/3/4 Sink block

Category: Software
Product Number: AD9361
Software Version: gnuradio version 3.10.1.1

Hello everyone, I am a new guy, I am conducting a testbench to transmit signals to the Ad9361 Arradio board (mounted on de10-standard) through the FMComms2/3/4 Sink block, I noticed that when I disable this Sink block, the signal on the QT GUI Frequency/Time Sink runs continuously, but when I enable this block, the signal runs a bit then stops, the signal appearing at the output of the QT GUI Frequency/Time Source block is quite small and seems to be like noise. May I ask how this phenomenon can be resolved. Below are the images describing the test bench that I am conducting

  

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