Pb runnning Fiji in headless mode

Hi all, maybe particularly @ctrueden

I am trying run jobs on a server that will use Fiji in headless mode. I noticed that when Fiji wants to update it may break the jobs. Is there an option to turn the update to never ?

I do not know if it is related but after launching 3-5 jobs launching Fiji, it may also crash, is there a limitation in the number of instances ?