There can be various reasons why you receive a new modem from Ziggo. Some possible reasons include:

1. Upgrading to a faster connection: Ziggo may decide to provide new modems to customers when upgrading their network to higher speeds. A new modem might be necessary to support the higher internet speeds and to ensure you get the best possible connection.

2. Technological advancements: Sometimes Ziggo introduces new technologies or standards that offer better performance, stability, or functionality. To take advantage of these improvements, it might be necessary to replace your old modem with a new one compatible with the latest technologies.

3. Replacement of outdated modems: If your current modem is outdated and no longer functions optimally, Ziggo may choose to offer you a new modem to improve the quality of your internet connection.

4. Defective modem: If your current modem has become defective, Ziggo may provide you with a new modem to resolve the issue and ensure you can get back online.

It is advisable to contact Ziggo for specific information about why you are precisely receiving a new modem. They can provide you with more details about the reason behind the replacement and any benefits you can expect with the new modem.