wpa_supplicant on Windows takes a long time to auth via freeradius

Hi, I'm noticing that at times my Windows wpa_supplicant takes a long time to authenticate via freeradius. It seems to associate quickly to a Linksys WAP2000 access point. However, it takes a full 4-5 minutes to complete the connection. I noticed that each time Freeradius sends an Access-Challenge it "wakes up in 4.9 seconds". Is this normal? I'm attaching the log files of both Freeradius and wpa_supplicant in the hope that someone can help me understand what's making my client PC take so much time to connect to my wireless network. Thanks, Vieri