title: How to resolve? ActiveRecord::TransactionIsolationConflict
body: <p>I'm getting nothing but <code>ActiveRecord::TransactionIsolationConflict</code> errors when I try to update records for one of my models. Retrying does not help.</p>
  
  <p>What should I do?</p>
  
  <p><em>Rails 3.2.13<br>
  Ruby 1.9.3</em></p>