IBM does a great job of putting together the documentation you need to support Lotus Connections problems. Though finding it all when you need it can sometimes be a challenge. Below is a list of the documents you can use to take that first step in diagnosing your issues and even using debug to take it one step further.
Test the reproducibility and try variations
Follow the general troubleshooting in the docs below. If that fails, implement the trace strings for each service and open a PMR:
IBM Collecting Data: MustGather for Lotus Connections 3.0 Files ...