Problems with a printer Samsung ML 2010 !!!

Hi,
I have a big trouble with my Samsung ML 2010 laserjet printer. The Driver is corectly installed and up to date on my machine, but after te first job printed the printers does not print the next job, but they are stored in print queue. When I power off and power on the printer the job’s stored in queue are printing, and again the next job will not print.

Why the printer behave like that ?
Please Help !

PS:
Ii have a second printer conected to PC a MF Canon MP210

Excuse my bad English 🙁