cRIO not running code the first time

[Wilzdabeast]

Hi, our team ran into a problem and we're looking for some help. We were testing our code, but when we deploy it onto the cRIO after booting it up, the CPU usage jumps up to 100% and a bunch of refnum errors pop up on the diagnostics tab. However, if we stop the code and run it again, the errors go away and the code works perfectly. We tried reimaging the cRIO, but that didn't work, and neither did building the code and running it as startup on the cRIO (in that case it acted the same as it does the first time code is run after the cRIO boots up- super laggy, 100% CPU and loads of refnum errors).
I checked all the refnums and they're all correct. Any idea what could be causing this behavior?