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I can help you sort this out, @boxdropmarksvill.
To isolate the issue, we can disconnect and reconnect the card reader. Here's how:
For Green GoPayment:
For Blue GoPayment:
Also, make sure that the Bluetooth is on.
If the same thing happens, you can follow steps 3 and 4 using this link: Fix issues with the GoPayment and QuickBooks mobile app card reader.
As always, feel free to read the topics from our help articles in case you need tips and related links while working with QuickBooks in the future.
Don't hesitate to drop a comment below if you have other questions. I'm always happy to help. Take care!