After running a varying number of hours my RP2040 Nano Connect will crash. Pushing the white reset does not bring the Connect back to life. The USB/serial port says there is no pullup resistor on SDA and SCL. The pullups are built in to the Connect. I have added external 5.1k resistors to see if that will help. Ctrl-D keeps complaining of no pullups. Only removing power restores operation. The SDA/SCL bus is only driving one SSD1306 OLED display. What is happening, what can I do to fix it?