Do you use one of the latest versions of sacd_extract? If so read the information displayed in the GUI the next time you are ripping an SACD, you will be alerted if audio frames are missing vs. the expected.
How do I know what version I am using? I have a version text file in my folder for the app that says:
sacd_extract version 0.3.9@setmind-13-g58db5f16fcf410ae4d6aeca226a067b37ade136a
Is there a later version I should get, and if so where?