Cannot connect to iTunes Store when purchasing

### Platform

- [x] iOS
- [ ] macOS
- [ ] tvOS

### In app purchase type

- [x] Consumable
- [ ] Non-consumable
- [ ] Auto-Renewable Subscription
- [ ] Non-Renewing Subscription

### Environment

- [ ] Sandbox
- [x] Production

### Version
0.13.2

## Report

### Issue summary
In my new app, I see a lot of failed purchases all with the same error: Cannot connect to iTunes Store

I've read that this happens `If the user cancels, receipt refresh will fail with a Cannot connect to iTunes Store error.` So basically on a receipt refresh. But it happens to me when users are trying to purchase...

I only use the `SwiftyStoreKit.purchaseProduct(product)` method and no refresh method.
Also, I have like 4 times the number of fails instead of successes. This is kind of suspicious to me...

Do others also have this high amount of fails? Or even the same error message on the fail?