Board Thread:Game Discussion/@comment-86.144.134.78-20180530094200/@comment-2405:204:B383:7AE7:2034:5B52:8FC5:DCC7-20180530131544

It is a quick fix but not absolute. Once you return to the series the older cars feature in, you'll start downloading the relevant content again. If you can stay away from the older series and cars, you should be good with the cloud save - delete - reinstall - restore strategy.