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.