I'm using FreeRTOS. This OS was using my SysTick timer. So, for my code, I utilized the PIT0 timer as my SysTick.
Problem is that in a few odd scenerios that I've yet to fully understand, my interrupt for this timer stops interrupting. My understanding is that the ONLY way for this to happen is if an interrupt of equal or higher priority is currently active.
I set the PIT0 interrupt to have priority 0 (highest priority). But, that made no difference.