From the Facebook Evo fan page, courtesy of Robert Becher:
"I contacted sprint about this problem tonight, they told me they knew about it already. Sprint said the only phones that have this problem are the ones that google gave to their employees and to the reviewers. It was a software issue,apparently the issue was only with the first 2,000 phones google gave out. With the phones being released on June 4th, the software issue is resolved."