No. Like I said, it is actually quite common for many yeast. Specifically low flocculating, top cropping type yeast. I would be way more concerned about your fermentation temperature. There are inexpensive ways to maintain a cool, steady temperature even during the summer. Consider rigging up a swamp cooler. The extra volume of water will help regulate a more constant fermentation temp. For most beers, any fermentation temp over 68-70 - 72 at the highest, can cause off flavors.