Server Intelligence Agent(SIA) went down unexpected

Data Services SIA goes down every 7 days. Example: if I start up SIA at 8am July 1st, the next time it will go down at July 8th 1am. All the services managed by SIA are still running when SIA shows in stop state from CCM. The action is just to click on start, and everything backs normal, there is no Data Services job failing. I have worked with SAP support, tried everything and created a new node, the problem still exists.
Any thoughts?

Thanks a lot for your help!
Wenjie Wu