Often, using an alternate internet browser resolves many technical issues when using the TurboTax website. However, if the difficulties persist, you may refer to the troubleshooting steps in the FAQ: How to clear your cache https://ttlc.intuit.com/replies/3302272
As well as the FAQ: How do I delete cookies? https://ttlc.intuit.com/replies/3301745
If you believe your internet connection is the culprit, please review the TurboTax FAQ: Check Your Internet Connection (Windows) https://ttlc.intuit.com/replies/3300260