Although your router supports b/g/n, what is it currently using. Some routers allow you to enable 'booster' or performance enhancing options that can pooch a Wifi signal to some devices. Others will allow you to set it to a specific revision of the protocol (ie: n class devices only)

If your router config is set to only use 802.11n; from what I have read, the Pronto is not going to have a good day as it will only work with b/g routers.

Also there is a firmware update out for the TSU9400 that addresses a wifi connectivity issue when coming out of sleep mode. If your interested in this one, I believe it's in the file download area.... If not you'll need to jump on the Philips site.