I would like to purchase this unit but I am afraid because of all the download issues I''ve read about on this forum. Have there been any issues with the 540s concerning download problems. If so, can a tech novice like myself wade through it and get it fixed. Some on here seem to have great technical skills and it might be simple for them to fix their problems. I'm not an idiot, just not as technically gifted as others. Any help would be appreciated.