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Different Tx power in consecutive repeatTransmit executions, with the same exact settings (Adalm Pluto)

Category: Hardware
Product Number: adalm pluto

I am seeing that, each time I do a repeatTransmit (under the same configuration), I observe different output levels, apparently in a random way. Both output levels are influenced by the Attenuation selected. For example, the plots below are two consecutive executions of the same Matlab code:

Example with "low" output power:

Example with "high" output power

What is the origin of this? Is this indicating a HW problem? 

I would be very grateful for any guidance understanding what is happening here.

Best regards,

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