I use a Dell E6400 at work, and provide support at work for them. Mine has NO issue like that, though we HAVE seen significant infant mortality issues with the HDD's in these units. We had some fail w/in a week of deployment, some w/in a month and others, mine included, (knock on wood) has been fine since August, though I'm sure I treat mine better than the users do. We run XP in our environment, 4,000 users (using various Dell models) on my site alone.
For those not 'in the know', 130w is the standard adapter for the E-series port reps, 90w is the standard with the laptop (in our environment anyway). If you didn't know, a D-series adapter DOES work on an E-series.