DBException thrown :: caused by :: 9001 socket exception [CLOSED] for 195.227.5.77:57966

Hello,

i receive the following error message very frequently on one of our 3 mongodb-nodes:

DBException thrown :: caused by :: 9001 socket exception [CLOSED] for 195.227.5.77:57966

Does anybody have an idea, what causes this message, and how can i get rid of it?

Regards

Christian