Errror in Webbrowser

Hello all
Can you help me how I can find my problem with the error in the web browser in the console?
here is my error but I don't find where is the problem.
There are three issues and they still repeat after about maybe 30sec
Thank you

GET http://ceps0005:8080/data/perspective/keepalive/OPT_Reports/12edda29/2067860584969989 net::ERR_INTERNET_DISCONNECTED
(anonymous) @ xhr-length-computable.min.js:5

(anonymous) @ PerspectiveClient.77c3c9fcdbd91247f462.js:2
e.exports @ PerspectiveClient.77c3c9fcdbd91247f462.js:2
e.exports @ PerspectiveClient.77c3c9fcdbd91247f462.js:2
u.request @ PerspectiveClient.77c3c9fcdbd91247f462.js:2
i.forEach.u.<computed> @ PerspectiveClient.77c3c9fcdbd91247f462.js:2
(anonymous) @ PerspectiveClient.77c3c9fcdbd91247f462.js:2
onKeepAlive @ PerspectiveClient.77c3c9fcdbd91247f462.js:2
processMessage @ PerspectiveClient.77c3c9fcdbd91247f462.js:2
PerspectiveClient.77c3c9fcdbd91247f462.js:2 onerrorLogger: {"e":{"message":"Network Error","name":"AxiosError","config":{"transitional":{"silentJSONParsing":true,"forcedJSONParsing":true,"clarifyTimeoutError":false},"transformRequest":[null],"transformResponse":[null],"timeout":0,"xsrfCookieName":"XSRF-TOKEN","xsrfHeaderName":"X-XSRF-TOKEN","maxContentLength":-1,"maxBodyLength":-1,"env":{"FormData":null},"headers":{"Accept":"application/json, text/plain, */*"},"method":"get","url":"/data/perspective/keepalive/OPT_Reports/12edda29/2067860584969989"},"code":"ERR_NETWORK","status":null},"message":"Network Error","name":"AxiosError","logData":{"msg":"unhandledrejection","errorMsg":"Network Error"}}
o.cerror @ PerspectiveClient.77c3c9fcdbd91247f462.js:2
o.sendLogItemsConsole @ PerspectiveClient.77c3c9fcdbd91247f462.js:2
i.sendBatch @ PerspectiveClient.77c3c9fcdbd91247f462.js:2
i.sendBatchIfComplete @ PerspectiveClient.77c3c9fcdbd91247f462.js:2
i.log @ PerspectiveClient.77c3c9fcdbd91247f462.js:2
e.log @ PerspectiveClient.77c3c9fcdbd91247f462.js:2
e.fatalException @ PerspectiveClient.77c3c9fcdbd91247f462.js:2
window.onunhandledrejection.window.onunhandledrejection @ PerspectiveClient.77c3c9fcdbd91247f462.js:2

top5:1 Uncaught (in promise) o {message: 'Network Error', name: 'AxiosError', code: 'ERR_NETWORK', config: {…}, request: Proxy, …}

ERR_INTERNET_DISCONNECTED

Seems pretty clear. Your network is flaky, or your anti-virus is interfering, or your IT department has other interference running.

Ok, I'll look into what's happening on the connection side,
thank you

But on the other hand, it doesn't happen with other projects. How is it possible?

You marked @pturmel 's comment as the solution. So I assume you confirmed what he said might be happening did happen?