Ah.  Many thanks for your suggestion.  But, I have no serious worries.  I have multiple copies of my wallet.  None of my coins are at risk.  Also, the bulk of my crypto coins are on deposit at exchanges. 

This thread has two themes.  (1) I worry that some instances of database corruption...happens ever more frequently with all databases that fork from original bitcoin...is/are related to processor architecture.  Specifically, Intel Xeon architecture.  I asked about this at the beginning of the thread...but nobody ever responded.  Many of my systems contain Xeon processors.  I worry that they may cause high risk of local database corruption.  (2) I believe that the current generation of full-node wallets (such as qt_bitcoin-0.15.1) become more fragile as number of blocks in the blockchain grows.  If true, then eventually full-node databases (containing complete blockchains) will only be supported by large corporations with ample money, backups, and software engineers.  Days of folks supporting a full node on the family desktop will be done.  Exchanges and financial industry will then be the only entities in possession of a complete blockchain.  Just like the current banking system...individuals will lose visibility and control of crypto coins.  Might as well stay with fiat. 

I was hoping that some developer would want to work on failure modes.  Look for root causes of bugs.  But nobody seems interested.