It could be temps guys, you all must be lucky and have some strains that are very heat resistant, I had this problem yesterday when my fan got unplugged, it only was at 99f when i caught it but the leaves were still slightly burned at the tips.
The plant will be perfectly fine, my plants are. I think the slowdown of growth is heat related also, if it gets real hot outside and i cant keep the temps under like 90f in my grow room the plants growth rate drops after a day or so of high temps. This is just in my experience, Im not saying those guys are wrong or anything.