Gimbal Misbehaving when fed telemetry data

[VCD]

I attached 3DR Gimbal + IMX6 only a bigger copter with CubebBack , running AC4.0.5
The gimbal link is on Telem2 using MAVLink1 at 230k
:
It configured rates itself


If I disconnect the serial to the gimbal connection, then the gimbal is nice and still ... when connected, it will do "random" movements

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[VCD]

Also verified:
This gimbal behaves well in a Solo, Another 3DR gimbal acts the same way. (so it is NOT the gimbal)
Tested with AC4.0.3 and AC4.0.5 - I have attached parameters.

MNT_TYPE is 2 (Solo Gimbal) - if set to 0 , then the Gimbal will not misbehave (nor be fully usable)

@Pedals2Paddles - you have extensive experience with Solo, could you please share your thoughts on this?