If the time suddenly changes, then this indicates that the server time has probably been adjusted. Unless you have ran queries to change the timezone settings of all users, this is the most likely cause.
This would also explain why members get these very long search timeouts (which can ONLY be caused by a change of the server time). The search problems should resolve themself once the time difference (server time set back 1 hour, so after 1 hour time things should turn back to normal) has lapsed.
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