Hi Richard

> I think it's just the way headers are - They aren't
> too secure a fit.

The connectors in my system are that heavy seated, that it requires a
dedicated force to remove the cable. I cannot imagine, that the normal
cables can remove on their own, only by their own weight.

> I was thinking of using Blu-Tack as it's removable.
> I don't know if it's available in your country but it's like a
> Plasticine or a modelling dough. It would hold things firm, but can
> be pulled off if required.

Any kind of this material contains ingredients, that make the material
soft. These softeners tend to "soften" also other materials: PCBs,
capacitors, ...

Again, my question you did not answer: are you sure, that the cables and
connectors are original Doepfer material


Florian