It could be a number of things. You mentioned an adapter connection, are you using power line adapters to connect your Slingbox to the network? If you are, see if those are still working properly. If the power line adapters are working fine, or you are not using power line adapters, check the article that is linked below:
Hope this helps!
Sling Media Moderation Team
Dear Slingbox users,
Today my slingbox stopped streaming and the network connection light started blinking. All cables checked and internet connection is available.
What could be the rootcause ? Adaptor or Power connection broken ?
Not sure what I could test or do, before buying a new one
All help appreciated