Your problem is IDM - stop using it.
It requires the servers to support "resume" (interrupted downloads) and these servers do not all support "resume" and/or "multipart" downloads.
Quote:
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Originally Posted by www.internetdownloadmanager.com
Internet Download Manager has a smart download logic accelerator that features intelligent dynamic file segmentation and safe multipart downloading technology to accelerate your downloads. Unlike other download managers and accelerators Internet Download Manager segments downloaded files dynamically during download process and reuses available connections without additional connect and login stages to achieve best acceleration performance.
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Same problem people have had with Safari on MacOSx and Firefox "flash downloader".