If you do anything long enough your body will adapt to it, becoming more efficient at it, which means your body will not be working as hard and breaking down as many muscle fibers as it did when you first started. That is why you need to keep mixing it up. You could do as Mondtster suggested and gradually decrease the reps and increase the volume over the span of a few weeks, then take a deload week, and start out with high volume again. You could also introduce some advanced lifting techniques like rest-pause, dropsets, supersets and statics to encourage more muscle fiber breakdown. Another technique I like is using slow negatives. For example, when doing barbell curls, after you curl the weight up, lower the weight in a controlled fashion over 3-4 seconds, stop prior to the bottom of the lift where you still have some tension on the arms and power the weight back up and repeat. I get a great burn doing these and you can use this technique on many different exercises.
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