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This thread is resolved. Here is a description of the problem and solution.
Problem: We believe that with object caching this would be resolved but it seems that wpml string translation doesn't support object caching is that correct?
Solution: In this case I would recommend you to use one of this cache plugins: https://wpml.org/faq/list-of-top-compatibility-recommendations/#cache Some of them use object caching.
Also, pleas update all outdated plugins and themes, specially WPML plugins. Outdated functionalities can cause conflicts in the code.