There was a periodic problem with the mysql process hanging when a search was entered with many search terms. This would bring the site down. It was happening periodically over the past 6 months. The host helped to identify the problem and I recently modified the way searches are processed, which should prevent the problem from reoccurring (I hope).
The initial and standard way searches were executed (using the search box at the top of the forum screen) was the standard manner and applicable to 'small boards' where the new search method should work with 'medium size boards'.......
System Unavailable Problem
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