It is possible that it is losing the signal from the router and picking up WAP at some point. I have had this issue before.

Phillips has a WIFI reconnect module that you can load onto program. Basically you can hit a button and it will automatically disconnect from the WAP and reconnect to the router. It only takes about 60 seconds to reconnect and it is much faster that a reboot.

I had to call Phillips to get this from them. For some reason they don't post it on the website. Probably don't want anyone to know they know it is an issue.