The icon issue is unrelated, everyone has that one since launch. It’s a visual problem. The other issue is perhaps a carrier or app issue.
Is it just happening when downloading that paper? Or can can you reproduce the issue with other downloads as well. Do you use an app to download that paper? It may then so be an aggressive power safe setting. But before we go there some more details are needed. What are the exact steps you take to download that paper? And what about other downloads?