Thanks for checking in with us, wlcummings.
Let's get your QuickBooks Desktop for Mac 2019 back up and running smoothly on a wired network.
To improve the performance and prevent any delays in response time, ensure that your network setup is within these recommendations.
After that, let's try to update QuickBooks Desktop for Mac to its latest release version.
If the problem persists, you can check out these recommended articles for other solutions:
As always, you can reach out to our QuickBooks for Mac Support if you'd like someone to be with you as you go through these steps. They can pull up your account in a secure environment and assist you further.
Keep me posted if there's anything else you need. I'm here to assist you further with running your QuickBooks Desktop for Mac smoothly.