Jennifer Nettles is well aware that some fans are upset over Sugarland's recent concert cancellations, but says she feared she would damage her voice even more if she didn't take time off for vocal rest. Nettles first noticed problems with her voice after the duo recorded new tracks in the studio between tour dates. "It's very scary," she told CMT Insider prior to a Thursday night (July 30) performance in Bend, Ore. "Because you think, 'All right, I can go out there -- and I can do tomorrow -- but I may not do the rest of the year if I do tomorrow.' And that is terrifying. And that is when you say, 'Wait a minute. Let's pull back.'" Nettles acknowledges she's disappointed the cancellations prompted some fans to publish negative comments about the duo on the Internet. "But at the end of the day, it also says, well, we have something that people really want. And sometimes they want it more ... than I have to give." Sugarland is scheduled to perform Friday (July 31) in Troutdale, Ore, and Saturday (Aug. 1) during Kenny Chesney's stadium concert at Qwest Field in Seattle. See the entire interview with Sugarland on the new episode of CMT Insider airing Saturday (Aug. 1) at 1:30 p.m.