Seems to happen more often than it used to. 

I tie simple hackle streamer type flies and they fall apart/slide down the hook after only moderate use.   

Can't find a lot of information/solutions on it so far.  

Usually use 3/0 Ultrathread for biggerish flies.  Is there a wrap technique that will help that I'm missing?  Add wire to secure it?  I haven't used wire in a long time as I just use a beadhead that adds enough weight for most situations. 

TIA.