I'm not sure if "random" means "under unknown conditions" or something else. Let me take my best stab at this by using "under unknown -- to me -- conditions":
1. The date corruption happens uniformly under known conditions. All date ranges using Bef, Aft and Bet are affected.
2. The shifting of name date is more random, occuring under unknown conditions, and affecting some names with the same variables, while not affecting others. The best way to see the problem is to look at names that have more than one word in the Given Name or Surname fields, or names that have Suffix data. (I had hundreds that were affected, and hundreds of similar names that have "not yet" been affected.
3. The disappearance of "shared marriage" events from one partner's profile, while leaving it displayed on the other, is "random", under unknown circumstances. I have not been able to isolate the conditions that caused it and have studied all the variables.
4. The duplication (or replication) of Source Citations is the same as items 3 above.