Version:           2.1 (using KDE KDE 3.5.6)
Installed from:    Ubuntu Packages
OS:                Linux

I can't seem to figure out WHY it is happening.  Sometimes it happens after a couple hours...sometimes after a day.  Sometimes when I have 6 torrents downloading, sometimes when I have one or two.  Most of the torrents I was getting were large (DVDs of various linux distros), but it DOES seem to get them...just sometimes I need to restart ktorrent.  Let me know if there is anything else you need.  I'm on Kubuntu Feisty...completely up to date.  The only two torrents that were running this time were the Ubuntu and Kubuntu i386 DVDs.

Here is the backtrace:
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Using host libthread_db library "/lib/tls/i686/cmov/libthread_db.so.1".
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[Thread debugging using libthread_db enabled]
[New Thread -1235839280 (LWP 1836)]
[New Thread -1243522160 (LWP 1924)]
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[KCrash handler]
#6  0xb7dc4b9b in dht::ParseRsp () from /usr/lib/libktorrent-2.1.so
#7  0xb7dc4dc2 in dht::MakeRPCMsg () from /usr/lib/libktorrent-2.1.so
#8  0xb7db9f21 in dht::RPCServer::readPacket ()
   from /usr/lib/libktorrent-2.1.so
#9  0xb7dba222 in dht::RPCServer::qt_invoke ()
   from /usr/lib/libktorrent-2.1.so
#10 0xb6dfe88b in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#11 0xb6dff330 in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#12 0xb758804c in KNetwork::KClientSocketBase::readyRead ()
   from /usr/lib/libkdecore.so.4
#13 0xb7588086 in KNetwork::KClientSocketBase::slotReadActivity ()
   from /usr/lib/libkdecore.so.4
#14 0xb759a143 in KNetwork::KClientSocketBase::qt_invoke ()
   from /usr/lib/libkdecore.so.4
#15 0xb759a1e6 in KNetwork::KDatagramSocket::qt_invoke ()
   from /usr/lib/libkdecore.so.4
#16 0xb6dfe88b in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#17 0xb6dff1a2 in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#18 0xb718b877 in QSocketNotifier::activated () from /usr/lib/libqt-mt.so.3
#19 0xb6e2144a in QSocketNotifier::event () from /usr/lib/libqt-mt.so.3
#20 0xb6d95a60 in QApplication::internalNotify () from /usr/lib/libqt-mt.so.3
#21 0xb6d9788f in QApplication::notify () from /usr/lib/libqt-mt.so.3
#22 0xb7559ce2 in KApplication::notify () from /usr/lib/libkdecore.so.4
#23 0xb6d281e9 in QApplication::sendEvent () from /usr/lib/libqt-mt.so.3
#24 0xb6d87e59 in QEventLoop::activateSocketNotifiers ()
   from /usr/lib/libqt-mt.so.3
#25 0xb6d3cd07 in QEventLoop::processEvents () from /usr/lib/libqt-mt.so.3
#26 0xb6db0136 in QEventLoop::enterLoop () from /usr/lib/libqt-mt.so.3
#27 0xb6daff46 in QEventLoop::exec () from /usr/lib/libqt-mt.so.3
#28 0xb6d97609 in QApplication::exec () from /usr/lib/libqt-mt.so.3
#29 0x080653d6 in ?? ()
#30 0xb65afebc in __libc_start_main () from /lib/tls/i686/cmov/libc.so.6
#31 0x08064ec1 in ?? ()