GS105PE - PoE pass through not working until hard reset

I'm having a similar issue. The netgear GS105PE is connected to a Cisco SG300-28PP, with is PoE+ (802.3at) compatible. The switch is correctly reporting that it detects the netgear as a class 4 device, which is -at, and allocates it the full 30 watts. However, the Netgear only initializes in -at mode about 1 time out of 20 or so, fairly randomly. Whether I reboot either switch, or just patch the netgear into a different port on the Cisco makes no difference. I tried this with several different GS105PE switches, and several different SG300 switches, including having the netgear be the only device plugged into the switch. Here is the power status on the Cisco switch:

switch7edc95#show power inline gi1

  Port      Powered Device         State          Status    Priority   Class
-------- -------------------- ---------------- ------------ -------- ---------
  gi1                               Auto            On        low     class4

Time range:
Power limit (for port power-limit mode): 30.0  W
Inrush Test: Enable
Legacy Mode: Disable

Port Status:               Port is on - valid capacitor/resistor detected
Overload Counter:          0
Short Counter:             0
Denied Counter:            0
Absent Counter:            7
Invalid Signature Counter: 0

On the Netgear, the PoE LED on the PD port 5 is orange, not green (thus, -af, and not -at) and fails to power up the AP, plugged into port 1, is needed (PoE light on port 1 flashes, indicating PoE error). The rare time I can get the Netgear to detect -at successfully, the AP powers up perfectly.

Please advise.

EDIT: The firmware on the Netgears is 1.4.0.9 (latest as of this post)