Please help!

I am having problems capturing on Premiere. I have a PC, Firewire input and Canon XM1 DV camera. Initially, I open the capture window, capture the scenes using firewire and there is no problem. However, when I go to capture again, the PC says that the firewire device is not installed when it is. Therefore, the PC does not recognise it and I cannot capture. So, I have to come out of the movie capture window, switch off the camera, switch the camera back on and go back in the capture window as if to reboot the firewire lead. As you can imagine, this is tedious. Before you say it, Premiere is set up for my camera settings in preferences. I do not have a video editing card installed. Does this play a part?