DRV8302: Buck convertor output voltage drops significantly when motor stalled

Tool/software:

Hello,

I've recently faced an issue with DRV8302's buck convertor. I set it up to output 3.3V to provide power for microprocessor on my driver. Everything works just fine, but when I stall the motor (stall it at large Iq FOC current, like 30A) the output voltage drops under 2V, which forces my MCU to reset ->  driver fails. 

This is how it looks on the scope:

I'll also provide my driver schematic:

Did anyone encounter similar behavior? What could be wrong with my design?

Thank you,

Adam