we're currently investigating a problem with one of our products, which seems to stall sporadically at a customers site. The used controller is STM32F103VE. I've detected at least one potential problem in our design, because VSSA/VDDA are seperated from VSS/VDD by an independant, galvanically isolated 3.3V power supply.
Of course, the manuals point out that these power supply domains should be connected. But what are the possible problems if this was done wrong as in our design? Could this cause a stalled controller?