I think it only happens when the full text search (the new one) is being incrementally populated. There is only a need for archives to be populated once every week at the most.
What would be the maximum amount of time you would leave before new topics appeared in a search ? 2 hours? 4 hours ? a day? more ?
I just experienced it now myself. Its definitely the new search. It happens just after the hour when the population kicks in. After the population is done the forum returns to normal.
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