The same Problem appeared on my phone today. I cleaned the lense but didn't work. Suddenly it worked again for 2 minutes but then again it didn't. That is the 3rd function that broke down within 1 month. Gmail doesn't work for 2 weeks now and voice recognition neither. And I only have the phone now for 2 months. I'm really disappointed. Can I send the phone back?
Definitely yes. You got a bat unit, unfortunately.
Please contact your seller to have your deviced replaced under warranty.