Can't connect PCB to laptop via USB

[Larsvest]

Unplug ads 1115 and try.
Measure your pcb voltage. Both of 5v.
Fdti problem here.

Arduino Drops after 12v applied

Hi, I’m sure this is posted somewhere on here, can’t seem to find it. I built a PCBv2, Cytron, ADS1115, no mma attached at the moment. Plug in the USB from Nano to computer, works great, all day long. Reads WAS shows shows yellow compass. When I apply the 12v to the board, nano stops transmitting (no TX LED). Any ideas would he a huge help thanks