Troubleshooting most encountered BGP issues

Trying to make a check list for troubleshooting common BGP issues . The list is as follows.
Configuration issues :
1. Incorrect MD52. Incorrect peer ASN, IP

Runtime issues :
1. Path flap 2. Path hijack

Would like to grow this list with appropriate pointers and details. Or, if anyone is aware of such such a list's existence , would be glad to added to that .