Lucene Indexes in Sitecore 6.6 getting corrupted (ArgumentOutOfRangeException)

never seen this exception?

Message: Non-negative number required. 
Parameter name: capacity Source: mscorlib 
  at System.Collections.Hashtable..ctor(Int32 capacity, Single loadFactor)
  at System.Collections.Hashtable.Clone() 
  at SupportClass.WeakHashTable.Clean() 
  at SupportClass.WeakHashTable.CleanIfNeeded() 
  at SupportClass.WeakHashTable.Add(Object key, Object value) 
  at Lucene.Net.Util.CloseableThreadLocal.Set(Object object) 
  at Lucene.Net.Index.TermInfosReader.GetThreadResources() 
  at Lucene.Net.Index.TermInfosReader.Get(Term term, Boolean useCache) 
  at Lucene.Net.Index.SegmentReader.DocFreq(Term t) 
  at Lucene.Net.Index.DirectoryReader.DocFreq(Term t) 
  at Lucene.Net.Search.Similarity.IdfExplain(Term term, Searcher searcher)
  at Lucene.Net.Search.TermQuery.CreateWeight(Searcher searcher) 
  at Lucene.Net.Search.BooleanQuery.BooleanWeight..ctor(BooleanQuery enclosingInstance, Searcher searcher) 
  at Lucene.Net.Search.BooleanQuery.CreateWeight(Searcher searcher) 
  at Lucene.Net.Search.Query.Weight(Searcher searcher) 
  at Lucene.Net.Search.Hits..ctor(Searcher s, Query q, Filter f, Sort o) 
  at Lucene.Net.Search.Searcher.Search(Query query, Sort sort) 
  at scSearchContrib.Searcher.QueryRunner.RunQuery(Query query, Boolean showAllVersions, String sortField, Boolean reverse, Int32 start, Int32 end) 
  at scSearchContrib.Searcher.QueryRunner.GetItems(IEnumerable`1 parameters, Boolean showAllVersions, String sortField, Boolean reverse, Int32 start, Int32 end) 

it means that your index is getting corrupted and need an app pool recycle…
to avoid it you can try with this trick:

<setting name="MaxWorkerThreads" value="100"/> 

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