This thread is resolved. Here is a description of the problem and solution.
Problem: Unexpected Server load from wp_icl_string_pages
Solution: a) Upgrade to the latest version of WPML
b) Visit WPML>>Support>>Troubleshooting page, then click on *Recreate ST DB cache tables* button. This will clear the String Translation caches, including the *wp_icl_string_pages* table.
c) Visit WPML>>String Translation and enable *Auto-Registering* option for all the String Domains.
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