Which software edition is it?
- Deluxe Federal and State combo (as opposed to Deluxe Federal only)
- Premier Edition
- Home and Business Edition
If you're using a wireless network, can you easily switch to using wired Ethernet instead to see if that makes a difference?
Are you using a VPN by any chance?
Did you try a 2018 manual update? It updates the Federal program and the updater tool itself.
https://ttlc.intuit.com/community/updating/help/manually-update-turbotax-for-windows-software-basic-...
After that, if problem persists, I'd see if running a TurboTax "Repair" helps any.
https://ttlc.intuit.com/community/bugs-and-error-messages/help/how-to-repair-turbotax-in-microsoft-w...
Or you can try uninstalling and reinstalling TurboTax.
Otherwise, here's how to phone TurboTax Support on Monday:
Hours are currently 5AM-5PM Pacific (8AM-8PM Eastern) Monday-Friday.
You can use this contact form to get a phone number, or it may schedule a callback.
https://support.turbotax.intuit.com/contact
