Hello michaelus84
Thank you for your interest in NXP Semiconductor products and the opportunity to serve you. My name is Omar and I will gladly help you with this.
It could be helpful if you share in detail the configuration of the HSADC. You can use one of the SDK examples to see if this issue persists.
I will be waiting for your reply, if you have more questions do not hesitate to ask me.
Best regards,
Omar