I understand that it can be frustrating to deal with such an issue. There are a few possible reasons why this might be happening, and I'll suggest some steps to try and resolve the issue:
Check for firmware updates: Ensure your Chromecast is running the latest firmware. It should update automatically, but to make sure, you can use the Google Home app on your phone to check for updates. If there's a new update, install it.
Router interference: Although you mentioned that the other Chromecasts did not have an issue in the same location, it is still possible that there might be some kind of interference. Try changing the Wi-Fi channel on your router to a less congested one. Channels 1, 6, and 11 are usually the best choices.
Reset your router: It's possible that the router might be causing some connectivity issues. Power cycle your router by unplugging it, waiting for 30 seconds, and plugging it back in. This might help refresh the connection between your Chromecast and the router.
Adjust your router settings: Check your router settings to see if there's any option for "Multicast" or "IGMP Snooping." If it's disabled, enable it, as this can help improve connectivity between the Chromecast and the router.
Check for possible interference: Ensure that there are no devices nearby that could cause interference with your Wi-Fi signal, such as microwaves, baby monitors, or cordless phones. Keep your Chromecast as far away from such devices as possible.
Power supply: Make sure your Chromecast is using a power supply from a wall socket instead of powering it from the TV's USB port. Some TVs may not provide enough power through their USB ports, causing the Chromecast to not work properly.
If none of the above suggestions work, it's possible that your new Chromecast might be defective. In this case, contact Google Support or the retailer you purchased it from for a replacement or further assistance.