[Problem altitude PVA]

I would be surprised if it was just humidity. I have been using PVA for at least 3 years with 0.4mm nozzles and we did 3 pieces last week with no issue with the 0.8 one. The weather is not particularly humid.
The only possible explanation would be that the coil was contaminated with the Covid-19, very activ in Geneva. 🤒
Could a setting in Cura be responsible?

[Problem altitude PVA]

I have a dual print with PVA and PLA. After a few layers the PVA is almost 1mm higher. Therefore. the PLA nozzle touches and tears off the material.
I use : Ultimaker 3-extended / printcore 0.8mm / Cura with standard parameters

Before, all print was allright and sudently it's bad.