Tring to install a sonic pad on my ender 5s1 but are getting random 'touch failed to deploy' error

My Ender 5S1 works fine with factory firmware, When I tried to install the sonic pad I keep getting random “touch failed to deploy” error.

First time was during the Z offset.

Got past that and did the manual bed level.

Heated the bed and started the auto calibration

first time it got to 12/16 before it failed,

But every other attempt it would fail on the 3nd calibration square.

Tried reseating the BLtouch cable, but same results.

I went back to the factory firmware and all works normally.

Not sure what I’m missing?

Thank you

Kosmo.