More guns sold means it's more likely to see more reports of problems, even if the overall problem rate is exactly the same as any other manufacturer.
From personal experience, I've had four Springfield products - 1 M1A, 1 M1A Scout, 1 TRP Stainless, and 1 Mil-Spec Operator converted to a TRP Operator. Not a problem with any of them. The Mil-Spec Operator is the only one that's gone to the shop and that's because I wasn't happy with my purchase and wanted them to convert it.
From personal experience, I've had four Springfield products - 1 M1A, 1 M1A Scout, 1 TRP Stainless, and 1 Mil-Spec Operator converted to a TRP Operator. Not a problem with any of them. The Mil-Spec Operator is the only one that's gone to the shop and that's because I wasn't happy with my purchase and wanted them to convert it.