I have a couple of questions, just to be sure:
- Do you use cordless phones or a microwave oven in the house? If so, do you have the wireless laptop close to it?
- How far away is the laptop from the wireless access point when being used on the table?
- Have you ever tried the connection using a cable to the router?
- Would you mind running the same TEST.BAT file when the laptop is sitting on the suspect table?