Couple of questions:
What version of OME is the problem observed on ?
How many discovery ranges are created and run ?
Is this service getting terminated when discovery task is run ?
Can you selectively run each discovery range and check if any specific discovery range is causing this issue ?
If the issue is consistent, please open a support case by calling this number: 800-945-3355, so that we can collect the logs and debug the issue.
Thanks,
Raj Shresta