REGISTER or login:
Do you mean errors in general? They are most likely file full, record locks and file not found. Is this just limited to CPF errors because there are others like CPA errors.
For example CPA5305 Record not added. Member xxxxxxx is full. This was the 1 and only error I could find in our QHST log for the past 2 weeks. We do not get many errors. A well coded program and proper database management should eliminate most errors. If you are getting more than you share you need to investigate the application that is the main offender.
Keep a log of the ones you get and notify the proper department.