Python Script node fails with socket write error

Hi,

I'm facing a problem running Python Script node within a loop of ~550 iterations, the error happens in random itteration, when I rerun the failing iteration it works fine. 

The error:

ERROR     Python Script                      Execute failed: Connection reset by peer: socket write error

Can someone advise if this is a Python or Knime node issue? any suggestion of how to solve it? 

python version: 2.7.10

Knime version: 2.11.3

Thanks a lot in advance