Starbucks says mornings are so busy that one in 8 mobile customers are abandoning orders

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• Starbucks reported disappointing sales Tuesday in both US and international segments.
• One thing that's not helping: the peak demand in the mornings is too high.
• The company said a mid-teens percent of mobile customers abandon their carts due to long wait times.

Starbucks is having a rough year so far.

The Seattle-based coffee giant posted worse-than-expected sales figures for its second fiscal quarter as visits from "occasional customers" declined, the company said Tuesday.