Page Build Failed Fetch Timeout

site: wangiloka-website.pages.dev deployment ID: 9444d776-9569-4292-abf8-270dc1cfcfa0 account ID: 6ee6622938e4476e7efd68784656d893 I developed a JAM stack website. It uses Express.js on the backend and next.js export for SSG. I can build the project locally without problem using the production backend. But somehow in cloudflare pages the build is incosistent, sometimes it works well sometimes it failed because of fetch time out as the picture I attached. Is there anyone have the same experience and know what is actually hapenneing? Because I don't think there is any problem in my backend. I can build it fine in my locally and it just that in cloudflare most of the time it failed to build because of fetch timeout. Thanks before!