If you don't upgrade you will lose your service. VM are switching off the older signal that your hub uses. They, rightly, don't want to run two BB signals at the same time. so what is called DOCSIS 3 will be the only one and you need a new compatible hub for this. It's a simple matter to swop hubs and instructions will be provided in the box.
Superuser 2017/18 Use Kudos to say thanks Mark answer as "helpful" only when the problem is solved Please don't send me private messages unless I ask you to. I do not work for VM. The advice I give is based on my best understanding of VM policy and practice. You rely on it at your own risk.