@VSP3818
Hi, May I know who is your internet service provider?
Have you experienced any disconnection issues before installing Deco XE75?
Could you please help me save a picture of the IPV4 settings on the Deco APP>More>Internet connection>IPV4 when Deco turned red again?
And there are some suggestions for your reference:
1. change the WAN DNS to 8.8.8.8/8.8.4.4: https://www.tp-link.com/support/faq/1855/
2. Connect the main ISP modem to another Ethernet port on the main Deco XE75.
I noticed that you have also sent an email to our Technical support. please also refer to the email for more assistance.
Thank you very much.
Best regards.