Cvt gearbox judder and snap noise

[Purplemonkey]

Hi all,   my 2006 jazz has developed the usual judder on pull away.
Ive change cvt oil twice, using honda brand. Used additive (syringe thing) suggest by forums  still no change.
Also the car makes a snap / crack noise now and again eminating from passender side ( assuming its gearbox related).
I suspect its the cvt drive belt?
80k miles
Please let me know your thoughts.

[Westy36]

First check I'd do, would be engine/gearbox mount.

[Purplemonkey]

First check I'd do, would be engine/gearbox mount.

I will check that,    would it not been picked up on a recent mot tho?  I Have to remove battery tray just to investigate?

[Purplemonkey]

Checked the mounting and appears solid.