How to find out which Reliability Events relate to Excel Web issues (Freezing and Sync) ?

Question

I need help on interpreting Stability Index with regards to Excel Web Freezing and Sync issue:

1. Stability Index
   1. Events
      1. Application failure
         1. Critical events (3)
            1. Runtime8roker.exe Stopped working
            2. SearchApp.exe Stopped working
            3. Runtime8roker.exe Stopped working
      2. Windows failures
      3. Miscellaneous failures
2. Stability Index - what level will trigger Excel Web freezing?