API Library error: No existing sandbox found, restarting, endless loop (Hoard of the Dragon Queen v1.5)

I'm running a Hoard of the Dragon Queen campaign which I updated to the latest version (1.5) yesterday. We had terrible lag yesterday including several Red Boxes "You've been disconnected from our servers" messages. I thought it may be the APIs and when I  looked at the API output console, it kept repeating "Restarting sandbox by user request... No existing sandbox found.  Preparing sandbox to start on game activity.", so I disabled them all, then restarted them one by one. It reduced the lag dramatically, but not completely. This morning, when I checked, the API Output console is back to repeating this message: "No existing sandbox found.  Preparing sandbox to start on game activity. Restarting sandbox by user request..." I deleted all the API scripts, but no luck. I made a new copy of the campaign and the API screen says this: "Error downloading scripts (probably no scripts exist for campaign.)" If I add any script, I get the following message: "No existing sandbox found.  Preparing sandbox to start on game activity." How can I fix this?

ok, I deleted the api scripts, rolled the game back to yesterday. The sandbox said it was empty and ready to import scripts. I was able to import several with no issues. It looks like deleting, and rolling back resolved the issue, however I cant delete any tokens from the screen. edit: It worked for a little while, but I'm getting the same problem.

More debugging. The issue appears to be with the ApplyDamage.js script that I was using. If I dont add it to the campaign, all others work fine. This issue only appeared yesterday.