Check to make sure you have a good, strong internet connection. If you are using a vpn, you might need to temporarily disconnect it. Same with anti-virus software.
Try closing TurboTax, clear your Cache and Cookies if you are using TurboTax Online, and reopen TurboTax. You can also try a different browser.
Also, make sure you have ran all updates.
If using TurboTax Online: Clear your cache and cookies. See this FAQ, for your particular browser.
If using TurboTax Desktop: Please see this FAQ.
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