I was browsing Grace's site yesterday and came upon this announcement:
https://gracedigital.com/pages/upgrade
The short of it is, if you have a Grace radio made before 2018, it'll stop working as of May 21st this year except for your preset stations. I filled out the upgrade form yesterday, but haven't heard back. I hope there is a significant discount off retail on a new unit as I really like the product.
ETA: It appears their offer is 35% off a new radio. That's much less than I was expecting, especially since they sell at full MSRP on their site.