Cyberpanel Dashboard too slow, /baseTemplate/ ERR_CONNECTION_RESET 200

Hello, suddenly, for a week, Cyberpanel too slow on Dashboard/File Manager.
I’m trying to reinstall the server (for several times), trying different OS, and fresh install of CyberPanel, but the problem still occurred.

When I check the browser console, I found nothing.
But, the header and sidebar of panel already loaded, except, content-wrapper.

It takes forewer to load the whole page.
After loaded, I check the browser console again, oftenly there’s errors when laoding assets on /static/baseTemplate/*

The message is always ERR_CONNECTION_RESET 200
Sometimes is the JS, fonts, and anything else inside of that directory.

How to solve this? Thank you very much.