Connected USB shield drops communication, when motors draw heavy load.

[macd200]

I currently have a USB shield mini connected via SPI to the esp32, which has a usb BT dongle connected to a ps3 contoller. When the Quad copters motor are connected but off, i have no issues with communicating to anything, however when i enable the motors and put some throttle on, the spi communication to the shield drops. then it can take from 4 seconds, to never to reestablish connection.
The 4 motors are driven via pwm to the ESC's, the board is seperatly powered from the motors. Was just hoping someone may have some insight to where my problem may be, I'm going to try moving the board away from the ESC's to see what happens.
Regards

I do hope this is the correct section to post this in.