Its not just a speculation from my end. I have seen this happen way too many times on Sense 5 and never while on AOSP (4.4.2 mostly).
What happens is whenever i use any torrent app or any downloading app like ADM (that uses multiple links to download, just like IDM in windows) the phone just freezes after about 5 minutes tops. It mostly occurs after a certain temperature is reached (45+ mostly) which as you all know is kinda a norm for our phone. After restart if i try again then the phone freezes under 2 minutes. This goes on for ever. Basically, a total nonsense for downloading.
Just yesterday i flashed OmniRom KK and have downloaded over 5GB (continuous 3-4 hours at a stretch) both using ADM and nTorrent and no freeze whatsover.
Moral: Ditch Sense if you are a downloader. Period.
I have used everything from EvolutionHD to ARHD to ViperRom to BladeElite to Stock Sense 5. As for AOSP i have tried this theory on OmniRom (currently on it), AOSB, CM11, AOSPA, SlimBean, etc. Downloading is just SH*T on Stock based rom.
Hm. I've torrented on Sense 5 from time to time (on Viper 4.0.6, using the Flud bittorrent client) and don't recall having issues like this. At worst I've had HTTP downloads hang at times, but heavy downloading itself doesn't seem to be an issue.
What speed do you get? Mind you, negligible speeds give no problem but only when the speed takes up most of the bandwidth of the I/O scheduler. In 4.4 the phone will slow down but at least it won't turn off.
XDA Developers was founded by developers, for developers. It is now a valuable resource for people who want to make the most of their mobile devices, from customizing the look and feel to adding new functionality. Are you a developer?