Walmart Spark delivery drivers say they are waiting over an hour to pick up orders — it's the latest sign of trouble for the retailer's delivery business

• Drivers for Walmart's Spark delivery service are waiting an hour or more in parking lots for orders.
• So are Walmart's pick-up customers, who rely on the same system when they pull up to a store.
• It's the latest issue for Walmart's delivery business, which is also coping with fraudulent drivers.

Every time an Alabama-based driver for Walmart's Spark delivery service accepts an order, a deadline for him to report to his local Walmart flashes on the Spark app. He often has around 10 minutes to pick it up.