pitch warping when recording using ASIO driver (internal Spark ADC clock jitter issue?)

[remi.delmas.3000]

Hi,
another issue I've discovered with spark:

recording over asio in reaper under windows using the spark asio driver v4.8.0, spark firmware v1.1.3.18, the pitch of the recording is badly warped :

pitch warped on recording
The pitch is still warped when played back through another audio interface so it means it gets warped at analog-to-digital conversion, ie right from the start. So it seems like the internal ADC of my spark has a strong clock jitter issue.