A lot of people report WIFI router interference with not only blackberrys but other cell phones also.
Try changing the routers channel number up or down to see if it helps. changing the number wont effect the other devices but may help with the interference you are getting. Most routers are factory set to 6.
__________________ If someone helps, tell them by clicking the Thanks buttonî
9810 BES Z10 on BES 9700 BIS