I have an RCOS Telescope and am using the ascom driver, and TCC Software version 1.5.26, and TCC Firmware version 2.18. Occasionally, the TCC will loose communication with my PC, and ACP will then "hang indefinitely " when trying to execute any command having to do with the TCC. I have tried replacing the TCC, the PC, the serial cable and the TCC power supply. Nothing seems to help. I can always cycle the power to the TCC, and it always re connects instantly. I also notice that if I just connect the PC to the TCC, it will remain connected for days with no issues. Seems to have a problem only occasionally when running a plan on ACP. Has anybody seen this before? I have tried replacing every piece of hardware without any luck. Almost seems like it is a software conflict. Any help is appreciated!