Wireless laptop connection spontaneously disconnects and reconnects

[Dean S. Messing]

Since loading F15 on a brand new Dell M4600 Precision a short time ago,
I'm seeing it spontaneously disconnect and reconnect to my home wireless
system. Below are a few hours of entries in /var/log/wpa_supplicant.log
from this afternoon.  There's no way to know the exact times because
there's no timestamps, but I cleared the file earlier and restarted
everything.  (Access Point MAC addrs are elided).

The disconnect is odd in that NM's wireless icon in the KDE panel shows
full power and the popup doesn't indicate that anything is wrong.  The
disconnects seem to last a couple of minutes.  Sometimes I see two or
three happen in the space of an hour.

The laptop is a new Dell M4600 Precision and the network hardware (from
lspci) is:

Network controller: Intel Corporation Centrino Advanced-N + WiMAX 6250 (rev 5e)

Any thoughts from the Wireless Wizards?

======= about 5 hours of entries from /var/log/wpa_supplicant.log =======
WPA: Group rekeying completed with ??:??:??:??:??:?? [GTK=TKIP]
CTRL-EVENT-DISCONNECTED bssid=??:??:??:??:??:?? reason=16
Trying to authenticate with ??:??:??:??:??:?? (SSID='whoopla' freq=2437 MHz)
Trying to associate with ??:??:??:??:??:?? (SSID='whoopla' freq=2437 MHz)
Associated with ??:??:??:??:??:??
WPA: Key negotiation completed with ??:??:??:??:??:?? [PTK=TKIP GTK=TKIP]
CTRL-EVENT-CONNECTED - Connection to ??:??:??:??:??:?? completed (reauth) [id=0 id_str=]
WPA: Group rekeying completed with ??:??:??:??:??:?? [GTK=TKIP]
WPA: Group rekeying completed with ??:??:??:??:??:?? [GTK=TKIP]
CTRL-EVENT-DISCONNECTED bssid=??:??:??:??:??:?? reason=16
Trying to authenticate with ??:??:??:??:??:?? (SSID='whoopla' freq=2437 MHz)
Trying to associate with ??:??:??:??:??:?? (SSID='whoopla' freq=2437 MHz)
Associated with ??:??:??:??:??:??
WPA: Key negotiation completed with ??:??:??:??:??:?? [PTK=TKIP GTK=TKIP]
CTRL-EVENT-CONNECTED - Connection to ??:??:??:??:??:?? completed (reauth) [id=0 id_str=]
WPA: Group rekeying completed with ??:??:??:??:??:?? [GTK=TKIP]
WPA: Group rekeying completed with ??:??:??:??:??:?? [GTK=TKIP]
CTRL-EVENT-DISCONNECTED bssid=??:??:??:??:??:?? reason=16
Trying to authenticate with ??:??:??:??:??:?? (SSID='whoopla' freq=2437 MHz)
Trying to associate with ??:??:??:??:??:?? (SSID='whoopla' freq=2437 MHz)
Associated with ??:??:??:??:??:??
WPA: Key negotiation completed with ??:??:??:??:??:?? [PTK=TKIP GTK=TKIP]
CTRL-EVENT-CONNECTED - Connection to ??:??:??:??:??:?? completed (reauth) [id=0 id_str=]

Dean