Do you have high speed internet ?
Things that can help:
Clear your CM download wish list once you have downloaded assets.
In CM "Options" blank out your UN & PW and leave them blank ... shut down CM ... restart Trainz CM and re-enter your UN & PW in the blanks, exactly as they were previously.
At Planet Auran "Edit Password" highlight your PW, and re-enter your same PW again right over top of it, exactly as it was previously ... save.
At Planet Auran/" Edit Profile"-"Save" it without making any changes to your profile.
When opening the CM let it update for a minute or 2.
When closing down CM let it sit for a minute or 2 before closing it down.
Wait a little while between shutting down CM, and opening the Trainz/Start, and starting Trainz driver/surveyor