Hi Frederik Grondin,
Was this Thing created by code or manually from composer?
Does this Thing have a lot of Property and Services?
Does Java heap space error occurs when this Thing is opened or it occurs otherwise too?
What is you ThingWorx version, Database type/version, tomcat version?
The Java heap happened when I was trying to open the Thing.
I'm currently in ThingWorx 7.3 and there was no other error in the App. Log.
The thing had many services and properties.
I couldn't duplicate the thing as well and I wasn't able to export all the files that had the same tag as this thing.
I should close this issue as I deleted the thing and recreated it.