What about doing a factory reset of the router? Assuming that it is not an eero, press & hold the recessed reset switch near the power cable. With the router turned on, press & hold this switch for about 20 secs, or until the light changes colour.
From the 29th of March our TalkTalk Community will move to peer-to-peer support and the TalkTalk team will no longer be here to support with queries. Don’t worry we still have plenty of ways to reach out if you need to speak to TalkTalk directly. For more details check out the link here
How to contact TalkTalk Broadband - TalkTalk Help & Support
