I'm running Bitcoin Core 0.20.0 on MacOS 10.14.6. Yesterday when I started it, it synced for a while but then got stuck on block 634126. Then I got an error saying "Error reading database, shutting down". I also got a message from "DiskWarrior Hardware Test Notice" that there were bad blocks on the external SSD I use to store the Bitcoin core data. After rebooting, now Bitcoin Core is still stuck on block 634126. For about 20-30 min it said "Connecting to Peers". The "Syncing Headers" for another 10-15 min with 0 active peers. Then I had 4 active peers but still no syncing. And now 2 active connections and still stuck. I usually always have 8 active connections and syncing is fast. Any idea what's going on?

I'm not totally convinced that there is something wrong with the SSD. It seems to work fine accessing all kinds of other files. And it has happened to me a few times in the past that I have gotten reports of errors on external disks when they were in fact OK. Particular with Drive Genius and Drive Pulse. However, this is the first time I have gotten a "DiskWarrior Hardware Test Notice" message. SoftRAID XT says the disk is OK. I have 6 external drives attached via Thunderbolt 3.