CSOM throwing random error

Hi there!

 

I've been using CSOM Framework for several months without important problems... Since a few weeks ago, I've been getting "Error 429" sometimes when one of my processes executes. Due to the fact that sometimes it works fine and sometimes it doesn't, I don't know what the problem cause is.

 

The error I'm getting is this one: System.Net.WebException: The remote server returned an error: (429). at System.Net.HttpWebRequest.GetResponse() at Microsoft.SharePoint.Client.SPWebRequestExecutor.Execute() at Microsoft.SharePoint.Client.ClientRequest.ExecuteQueryToServer(ChunkStringBuilder sb)

 

For the record, I get this error when I try to see a Resource's assignments.

 

Thanks a lot.