No no its not the BSNL problem , its a common problem that users face while downloading large files. i too face it t but i use IDM downloader (i personally recommend it) which simply refershes the link and resumes it, if the server at the other end supports resuming. For large files always use a downloader rather being dependent on the browser...
Try IDM (5 MB)
http://www.internetdownloadmanager.com/download.html
BTW experiencing very HIGH PINGS today. Online gaming is a nightmare! sorry
ARKHAM ORIGINS you have to wait a little bit longer...