Echo is suddenly crawling site over and over, spiking bandwidth use

We have been using Echo RSS to pull in feeds for a long time without any issue.  Last week, we noticed a huge spike in bandwidth use.  When I look at the site logs, I see echo rss crawling our own site over and over again suddenly.  It had not done that in the past, and we did not make any changes to the settings between now and then. We need help identifying what's going on to troubleshoot the issue and get things back to normal.  Any ideas?