Broken wire : Refnum Class diagram objet

[KLSsuperstar]

Hi,

Many times on my applications. On several computers, different project and LabView version (2011 to 2014).

A "Refnum Class diagram objet" needs to be "updated" because its wire is broken.

The attached example shows a valid WaveformChart Refnum class reference which is suddenly and aleatory "broken" and needs to be reset. Otherwise the vi is broken ...

(In the example attached the Refnum "selected" by labview ar Control and "XControlTREE", the problem has no relation with its existence.)

Thank you