Wireless connection dies after two or three days

[likeapear]

Hello, wireless connection dies after two or three days on my WL-500g. On client side is WinXP Home or Prof. I see my router in list of available networks, but can't connect. Everything works fine after router restart. This problem I can see only when an USB memory stick is permanently plugged into router. When it is unplugged then works fine. I'm using Oleg's firmware 1.9.2.7-7b.

[likeapear]

Upgraded to 1.9.2.7-7c and seems to be OK.