JD is correct here. There is no way to know exactly what happened here. You may be able to factory reset your V2 hub and add all of your Zwave devices again and it may work fine. You may also think to yourself and say that I have had this hub along time and it may experience hardware problems soon, so I’m going to buy a new hub now and not take a chance that there is something wrong with the hub and have to rebuild your entire setup for a third time. Its your choice and depends on your budget. You can’t buy the V2 new but you can buy the V3 new! It also depends on how large you envision your setup getting. In my opinion the V3 will run fine with up to 150ish devices and 30ish drivers and 100ish routines without having any performance issues and that will be all you will ever need. If you want to go over that then you could add a Station later to expand your setup. Remember only the V2 and V3 support Zwave so you will need one of these regardless unless down the road you have replaced all of your Zwave devices with newer Matter or Zigbee ones.
I also wanted to point out that you can run the hubs in any combination you want. For instance, a V2 and V3 and Station or just a V2 and V3 or 2 V2’s or 3 V3’s etc. The only thing that changes when you go to this type of setup is that routines that involve devices on different hubs will run in the cloud and routines that involve devices on just one hub will run locally as long as the routine doesn’t include anything that’s not attached locally to the hub like Notifications or cloud integrated devices like Ring cameras etc.
There is also a new Hub replace feature that allows you to transfer all of your devices and automations to a new or different hub. I tested this recently and it works fine as long as you are moving to a hub with the same or more memory. Another user in the forum has tried going from a V2 to a V3 and he was not successful because the V2 has more memory then the V3. He has a large setup so it didn’t work for him but I would imagine it would work just fine for a small to medium setup. If you want to see how it works you can see my Hub Replace Walkthrough Here . This feature is also supposed to backup your hub periodically and allow you to buy a new or use an existing hub to replace a hub that is no longer functioning and offline. No one knows yet how it actually works yet or if it works or when the backups are occurring. I’m testing that now and will be posting about it soon. If it works this would also be an option for you to keep your V2 and use this function to restore to a new hub if your V2 dies but I don’t think it has been tested yet. You would need to go from V2 to V3 because you have Zwave devices and that would be the only way to do it.