I have an Analog Discovery Pro ADP3450. Using it in Network Analyzer mode, I tested it with the generator (#1) connected to Channel 1 & 2. If the configuration is set to the larger buffer, when sweeping from 1 to 10 kHz, the numbers drop out at multiple points in the vicinity of 2 kHz. If the configuration is set to the smaller option, there is no problem with the data.
I got it recently (March 2023) and it seems to work fine in oscilloscope mode using the larger buffer.
I don't think it's defective, just wondering if I'm doing something wrong.