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I have 11 boards of our prototype with the STM32L4A6AGI6 (i.e. 169 BGA) assembled. 5 of them work fine. The other 6 eventually loose debugging connection. It doesn't happen immediatelly i.e. I'm still able to run a few lines of code but then it reset...
USB_OTG_FS: In one of two projects unselecting "Activate_SOF" in the .ioc environment doesn't disable its entry in the code! Error of the IDE or is there something else keeping the SOF enabled? As said, in another project it works a as expected. 
Usually I find this information in the pin mapping description, e.g. for the device STM32L4A6AG I would have assumed to find it in section 4 "Pinouts and pin description", where all other stuff like SPI, I2C, FMC, EVENTOUT, TIM etc. are described.Lin...