hello, a new test, with only ccdsoft running, and stl11k : autoguide with 2 sec frame, (autoguide deactivated in ccdsoft) image with 3min frame, it's running for 3 h , the error appear. then , all other software are not in cause of error. only ccdsoft, driver, or w7 services running in background. it's cannot be ccdsoft, the error appear in maximdl, or skyX too in the previous test. so, driver or something in W7... or hardware issue, but i have changed everything (camera also), except the power supply. i plan to change it. help welcome. thank you regards