Just for anyone who might find this useful:
Since a PSU change a week ago I had no disconnects whatsoever compared to a lot of them (multiple during a single flight on all stages) before that. The old one died on me and after I put in the new one haven't had a single disconnect.
Hardware:
Intel E6300 @ 2.8Ghz
Asus P5KPL-SE Mobo
2x2Gb Kingston PC-2-5300 667Mhz RAM
GeeForce 210 Graphics card w/ a gig or DDR3 (I know...)
400W Chieftech PSU which died substituted with a 500W one
1 500gig Seagate SATA drive (system, on which FSX resides on partition 3 of 3), 1 250gig Seagate IDE drive, and 1 1TB Seagate SATA drive
cheap A4Tech webcam and Saitek Evo Force Joystick
mouse is on USB
All drivers up to date.