The "Zotero has stopped working. Windows is looking for a solution." dialogue comes up (might be misremembering the exact words, but it should be familiar to Windows users), and then it lets you sent a report to Microsoft. When you submit the dialogue, Zotero closes automatically. I'll note that I restarted Zotero and it finished the sync just fine, and no crashes since. But it was a strange occurrence (I find Zotero to be quite stable), so thought I'd submit it.
Upgrade Storage
I'll note that I restarted Zotero and it finished the sync just fine, and no crashes since. But it was a strange occurrence (I find Zotero to be quite stable), so thought I'd submit it.