I've only joined Nikonians today and I notice your message was back in November so I hope I'm not too late!.
I've owned a D1X since it first became available in the UK (June 2001). I love it and hope you do too. I also own an F5 and so it feels very similar although in use, it can be quite different (as I'm sure you've found).
If you are still having issues with the camera, feel free to get in touch in case it's something I have come across.
I've added a link to my website so you can see some of my pictures many of which are taken with the D1X (for eample, all my Big Cat photographs)