Springframework java.net.UnknownHostException appears randomly

I have a problem with a Springframework project. I make a call with OkHttpClient and sometimes I get the error java.net.UnknownHostException: www.strava.com: Name or service not known

I tried to insert a 1 minute timeout thinking of solving the problem but if the call fails it fails after a few seconds The call is made successfully a few times and other times the described error returns, but the call is always the same...

    String STRAVA_URL = "https://www.strava.com/"
    String url = StravaConfig.STRAVA_URL + "/api/v3/oauth/token"; 

    RequestBody requestBody = new FormBody
        .Builder() 
        .add("client_id", StravaConfig.CLIENT_ID) 
        .add("client_secret", StravaConfig.CLIENT_SECRET) 
        .add("grant_type", "refresh_token") 
        .add("refresh_token", account.getStravaRefreshToken()) 
        .build();

    OkHttpClient client = new OkHttpClient.Builder()
            .connectTimeout(1, TimeUnit.MINUTES)
            .build();

    Request request = new Request.Builder()
            .method("POST", requestBody)
            .url(url)
            .build();

    Call call = client.newCall(request);
    Response response = null;

    try {
        response = call.execute();

        ...
    } catch (Exception e) {
        //HERE THE ERROR
        e.printStackTrace();
        return e.toString();
    }`

Solved Follow this https://serverfault.com/questions/578082/java-and-etc-resolv-conf-dns-server-failover