I am using QT5 in visual studio.

I have the function below where I call singleShot for a some ms value according to the GUI (in this case 1000 ms). After single shot has passed it should call reset_TEER() and then rest some values and recall TEER(). This keeps the GUI responsive in-between measurements.

This works great, except that sometimes at 12:00 AM (midnight) singleshot never times out and the reset_TEER() is never called again. The last time I tried this it ran from 10:39AM 8/20 to 12:00AM 8/22. So, I expect Sunday is the problem, but I can't tell if Sunday is the only day that causes the problem because I have seen this happen once before (at the same midnight time). Other times it works for four days no problem.

Qt Code: 
  1. void CLASS::reset_TEER(){
  2.    //do stuff
  3.    TEER();
  4. }
  5.  
  6. void CLASS::TEER(){
  7.     for(){ //generic for loop here
  8.     }
  9.     TEER_count++;
  10.     if (TEER_count < ui.num_cycles->value() && ui.enable_repeat->isChecked())
  11.         QTimer::singleShot(ui.wait_num_cycles->value(), this, SLOT(reset_TEER()));
  12. }
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I can't find any information about why singleShot would do this. I do see that QTime will return to zero after 24 hours but they don't seem related. Should I be doing this a different way?

Thanks for your input.