Help.

I am using CGminer with the following options
cgminer --scrypt -o http://newlc.ozco.in:9332 -u lololol -p fakepassword --thread-concurrency 6144 -I 18 -g 1 -w 256
Pause

And I get the following log:
[2013-04-27 21:02:04] Probing for an alive pool
[2013-04-27 21:02:05] Long-polling activated for http://newlc.ozco.in:9332/LP
[2013-04-27 21:02:34] LONGPOLL from pool 0 detected new block
[2013-04-27 21:02:41] Pool 0 stale share detected, submitting as user requested

[2013-04-27 21:02:42] Rejected 02c59d68 Diff 92/15 GPU 0  (prevhash-stale)
[2013-04-27 21:03:13] Accepted 077acee3 Diff 34/15 GPU 0
[2013-04-27 21:03:51] LONGPOLL from pool 0 detected new block
[2013-04-27 21:04:15] GPU0: Idle for more than 60 seconds, declaring SICK!
[2013-04-27 21:04:15] GPU0: Attempting to restart
[2013-04-27 21:04:15] Thread 0 still exists, killing it off
[2013-04-27 21:04:15] Error -6: Creating Command Queue. (clCreateCommandQueue)
[2013-04-27 21:04:15] Failed to reinit GPU thread 0


CPU and windows locks up for about 35 seconds, then it quits with this error.

I have a HD5850, i5 overclocked, 4gig rams, 64bit windows 7.

Can anyone help me? Thanks