Try disconnecting it, blow out connections. You may need to clean connections, we find that rubbing alcohol on a cotton tip (q tip) works well for this. Then make certain it is put together correctly and you have a good connection. We've found usually any issues are result of either poor connection or faulty controller.
First of a good cleaning is in order. Remove all accumulated dust and dirt or grime that may be there. If cord is twisted badly you will have to replace it original replacement. Don't buy any of those cheap replacements. Check all the plug in inserts to make sure they are clean. Hope this is of help to you.