Hi,
this "search service" is a X1 service running on your local computer, not on internet. The error you are receiving means that the search service is crashing for some reason.
Can you check the X1 logs folder (by default located at C:\Users\{USERNAME}\AppData\Local\X1 Search\logs for any xml files whose names contain "crash"? Examining one of those files may hint at what is the problem with the search service.
Jogy