Digital Ocean fast deploy offline

Hello all,
I have six nodes deployed to DO via fast deploy from my home PC. They have been mining great for about 6 months. In the last couple weeks two of my nodes have gone offline. I’m not sure where to begin troubleshooting. I tried shutting down the droplets and restarting them with no effect. Anything pointing me in the right direction would be great!

This is common problem. It is because they have all run out of disk space. Please follow this instruction to upgrade to v2.1.7 and enable light sync mode.