Wi-Fi extender 2nd gen making high pitched noises even after cleaning.

The concern is not "Home Security Devices And Equipment" help related........... Topic moved here to the proper help section, and for greater exposure to Comcast corporate employees (The Digital Care Team) for assistance.

Hey there, @user_81eb6v! Thank you so much for taking the time to reach out to us here on the Xfinity Forums. I am very sorry to hear about the experience with the 2nd Gen WiFi extender making noise, it certainly is not what we want for our customers. I would be more than happy to further troubleshoot with you, and see what we can do to resolve the issue. Can you please send us a DM to get started?

Please send us a direct chat message with your full name and complete service address to “Xfinity Support”. To do so, click on the chat icon located at the top right of this forum's page.

Here are the detailed steps to direct message us:

1. Click "Sign In" if necessary. 
2. Click the "Direct Messaging" icon. 
3. Click the "Start new conversation" (pencil and paper) icon. 
4. In the "To:" line, type "Xfinity Support". 
5. As you type, a drop-down list will appear. Select "Xfinity Support" from that list. 
6. An "Xfinity Support" graphic will replace the "To:" line. 
7. Type your message in the text area near the bottom of the window. 
8. Press Enter to send it.

https://forums.xfinity.com/conversations/guidelines/how-to-direct-messaging-within-the-forum/697ba1e570934d009185c514