voltage buildup on some unconnected AI-112 terminals

Hi

I have this strange issue that some terminals tend to autobuildup voltage. And some doesn't.

Usually it doesn't bother me since the module is measuring correctly when I connect sensors. BUT the buildup goes up to the range limit of the module, 10.4V and generates errors. 

I have read the Knowledge Base 2XBC04Q2 but I'm not really happy with its solution. Would this mean that I have to connect a 100Ohm resistance to every channel? And why do some AI-112 modules show this behaviour while others don't.

Thank you for any help

Yves