I have been having this issue for a while (5 months). That is I create a graph where I process Sentinel-1 (SAR) data. The graph does not error; rather, it stalls at 24%. I can process the data by hand but it would be nice if the graphic builder functioned. Any thoughts?
SAR Processing is using quite a lot of memory. So this might be the issue.
How much RAM does your system have?
How is your graph defined? Which processing steps does it contain?
Alternatively to the GraphBuilder you can also use the command line and use the created graph file on the data.
How this could be done is explained in this guide:
Bulk Processing with GPT - SNAP Wiki