@ozyblu 

Hi, thanks for posting question here.

If you are experiencing intermittent wireless connection on the range extender, please refer to the following suggestions:

1. Confirm the extender is properly located based on this guide.

2. Make sure the firmware on the extender is up-to-date.

3. Enable “High Speed” mode if you have a dual-band extender.

4. Disable Parental Control or Access Control (Blacklist/ Whitelist) on the host router if they have been enabled for the extender, according to this guide.

5. Turn off Band Steering (also called "Smart Connect" or "Whole-Home Wi-Fi") and set up different Wireless names for the router's 2.4Ghz and 5Ghz Wi-Fi.

6. Fix the wireless channels on the host router, such as channel 11 for 2.4GHz and channel 48 for 5GHz.

For more details, you may also refer to this thread.