Netgear router & MSN Messenger

I'm having a curious issue of late, namely that every time I try and send a file or receive a file via Windows Live Messenger (8.0.787 and 792), my Netgear WGR614 v6 router switches the wireless off. It's in the next room and becoming a major annoyance to have to keep restarting it. But that's definitely the cause; someone can offer to send me a file and I can choose to cancel it, but if I accept a file the network connection times out within a couple of minutes and looking at the router the wireless light has gone off. I had wondered if maybe I was overloading it, but I had 5 torrents, 2 web browsers (on automatic refresh) and an instance of the Matrix Online running earlier with no issue. It's just Messenger's file transfer thing. I've firmware-upgraded the router, and if it weren't for practicality reasons I'd give up and go back to good old 802.3u (which incidentally works normally after the wireless connection has bombed). It happens on both my desktop PC and laptop, both using 802.11g (as is the router). Security is off (but so is broadcast SSID). I'm mystified by this, does anyone have any thoughts?

 

Ever tried MSN Messenger 7.5

 

All sorted now. I went through the router disabling everything until the problem disappeared, and it hasn't come back since I disabled the Stateful Packet Intrusion firewall.