For current owners of Garmin Vivosmart Fitness trackers with display issues you can upgrade to the Vivosmart HR band for free*
So many people have had the OLED display go bad on the vivosmart band that if you have the display going bad (starts with losing the top or bottom parts of the display) that they will upgrade the band to the vivosmart HR as long as you pay return shipping for your band.
Just call 1 (800) 800-1020 and speak to the garmin rep if you have the display problem which is extremely common. I was told un-officially they have extended the warranty on the display to two years from one as its a known widespread problem. Also another option was a refund. Great customer support on their part. Please don't abuse if you don't have an issue.