Hello,
what version of readout are you using?
do you have some output log please?
It’s possible you are short on the number of data pages, and I’m not surprised that enabling recording adds enough latency to run out of pages for DMA. (it’s not only a matter of throughput, as pages are changed for each new TF / link, and there are some internal timeouts).
Please give it a try with 2000, and also set rdhUseFirstInPageEnabled = 1 for proper timestamping. Also, linkMask does not need to be set for readout v1.3.8.
cheers,
Sylvain