Hi again @Drex! We investigated this, and our firmware engineer confirmed that the Hardware Test is currently based on the set measurement interval (which it shouldn’t). We will update the Hardware Test to be independent of the set measurement interval to improve the user experience. (The hardware should work fine as long as you can see the reading on the home screen).
Thank you so much for reporting this issue! Please feel free to let us know if you find other issue or have any questions. Thanks again!