I am working with 2 racks of Sinara hardware with a total of 3 Urukul AD9912 boards. Two of the Urukuls used to work fine in rack #1. However, after running them in rack #2, the output signal from the DDS suddenly dropped to 67 % of the frequency requested by ARTIQ, and the signal appears very noisy (see picture attached). This behaviour was then reproduced after moving the boards back to rack #1. The third Urukul board which was run for the first time in rack #2 shows the same behaviour.
It seems like rack #2 might be the culprit and is breaking the Urukuls, however I am not sure what exactly could be causing this problem. Note that I powered both racks separately with the same exact power supply, since the two Kaslis are identical and have the same requirements.