You might try turning your router off and on again in case you had a momentary disconnection.
Then, try exiting the program and logging back on, or turning off and then restarting your device. You could also try a different browser; Chrome generally works well. You might also try clearing your cache and cookies. If after trying all of the options mentioned you still have the same problem:
See this help article for instructions on how to contact TurboTax customer support depending on which product you are using.
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