I just launched a website and for the 1st 30 days was only getting word of mouth traffic with good analytic #s. Bounce rate around 32% and average of 3 minutes visit duration. Now that I've submitted a sitemap, I am getting about 72% bounce rate and only 1 min on the site. The weirdest thing is the direct traffic landing on dynamic php pages is the bulk of the high bounce rate and most of them show 0 seconds for duration. I submitted these dynamic pages in my site map so wondering if someone is using that information and crawling my site???? Example of the dynamic urls:
Any ideas of what it could be? Should I be worried?