Mining times out?

[Sonicx00222]

Hey, it's me again!
I was wondering, how come every time I start my miner (I mine at Eclipse MC), it mines for about 30 mins then stops, saying "warning: job finished; miner is idle"? It doesn't prevent me from mining, it's just annoying how I can't mine overnight because of this. I use GUIMiner, and I've got a (crappy) Intel 4000 GPU

[beekeeper]

Maybe some security measure. I remember Inaba saying he have some of those active against low hash rate miners after he got hit by several botnets. Maybe try to switch pool for a while?