SES and Cognito timeout on Lambda

Hi
I've some problems using the SES and Cognito services in some Lambda Functions (Runtime NodeJs 12.x).

A lot of times the lambda go on timeout around 10 times before giving me a successful response.
I also use another service (RDS w/AuroraDB) but this one never gave me problems.

I think the way I use them is correct because, after the first tries, the lambda reach the end.

//SES CODE
//DECLARATION
const ses = new AWS.SES({region: "eu-central-1"});

//{...}

//SES REQUEST
try{
    const sesRes = await ses.sendRawEmail(emailParams).promise(); //<- GET STUCK HERE
    console.log();
    return {
        isBase64Encoded: false,
        statusCode: 204,
        headers:{
            'Access-Control-Allow-Origin' : '*',
        },
        body: null
     };
}catch (err){
    return {
       isBase64Encoded: false,
       statusCode: 401,
       headers:{
           'Access-Control-Allow-Origin' : '*',
       },
       body: JSON.stringify({
           message: "FINAL DB error",
           error: err})
       };
    }
}

//COGNITO CODE
//DECLARATION
const cognitoPool = new Aws.CognitoIdentityServiceProvider({region: "eu-central-1"});

// {..}

//COGNITO REQUEST
try{
    await cognitoPool.adminCreateUser(params).promise(); //<- GET STUCK HERE
    await cognitoPool.adminAddUserToGroup({
          GroupName: userGroup,
          Username: userInfo.email,
          UserPoolId: process.env.USERPOOL,
    }).promise();
}catch(err){
    return {
       isBase64Encoded: false,
       statusCode: 401,
       headers:{
            'Access-Control-Allow-Origin' : '*',
       },
       body: JSON.stringify({
             error: err.code,
       })
     };
  }