Hi ,
These are just system warnings you can ignore them.
If your data load is taking more time than usual i.e. in yellow for long time then you should check the background job (starting with *bi*req*) in SM37 , IDOC in source system (in the load monitor from the menu bar goto extras--> environment--> ALE inbox of source system ), RFC in source system in sm58(extras--> environment--> TRFC Monitor).
Thanks
Kamal