Comment 1 for bug 1772669

 Timed out waiting for response from cell 00000000-0000-0000-0000-000000000000

This might be the root cause

as far as I can tell all 0 cell is cell 0 ?

There's a FIXME in the code so I guess it's a known issue.....

        # FIXME(danms): If we raise or timeout on a cell we need to handle
        # that here gracefully. The below routine will provide sentinels
        # to indicate that, which will crash the merge below, but we don't
        # handle this anywhere yet anyway.
        if self.cells:
            results = context.scatter_gather_cells(ctx, self.cells, 60,
                                                   do_query)
        else:
            results = context.scatter_gather_all_cells(ctx, do_query)