Occasional failed to open admin because of syntax error

Questions and Answers Strapi Admin
1
System Information
  • Strapi Version: 3.6.8
  • Operating System: Ubuntu (Heroku)
  • Database: postgresql
  • Node Version: 14.15.1
  • NPM Version: 6.14.8
  • Yarn Version: 1.22.15

I’m deploying Strapi on heroku and the /admin occasionally (quite often) fail to load because of JS syntax error. It’s simply accessible one day and suddenly the next day, even though I wasn’t doing any rebuild or redeployment or even adding new data, it failed to load. Here’s the console error.

console-2
console-21476×433 38.1 KB

And it’s coming from different lines at different times. And the funny thing is at the same time, I can open the admin from my mobile phones. Does anyone having similar issue. It really drives me crazy now.

Dev environment has no issue at all.

Thanks for the help!