kc868-a6 Bluetooth issue

[AndyW]

I have a usecase for the kc868-a6 that requires the bluetooth to work with esphome. As soon as I enable anything bluetooth related I get fatal errors and the wifi never connects to the network.
This is the code I am trying to use that appears to corrupts the esp32.

substitutions:
name: test
mac_address: C8:47:8C:E1:E2:E2

esp32_ble_tracker:

ble_client:
- mac_address: ${mac_address}
id: client0

switch:
- platform: ble_client
ble_client_id: client0
name: "enable bluetooth connection"

Any thoughts on why the esp32  does not like the bluetooth settings? After removing the bluetooth settings and reflashing I am able to connect to the controller again.
Thanks in advance.
Andy