It’s a Motu 8D used in AES with my Crookwood converters.
Latency inside the Motu is 256 samples.
In Wavelab I have 75 ms asio guard.
I tried with bigger latency (512 and 1024), but it’s the same. I don’t have DPC spikes either.
Sometimes out of 10 tracks, there is one with a zero padded buffer, sometimes 3 or 4 out of 10.