Panda A4 issues

[Huss]

I have an Android (4.0.1) app that connects to multiple proprietary
Bluetooth devices (4) on start-up. During the connection of these devices,
at no particular order of connection, the LCD screen freezes and the
system reboots. After examining the /proc/last_kmsg log, I noticed that
the reboot was caused by the MPU Watchdog Timer reset (PRM_RSTST=0x8). I
also connected a serial cable to debug console and noticed just before the
Bluetooth init the following:
event { 'add', '/devices/virtual/bluetooth/hci0/hci0:2', 'bluetooth', '',
-1, -1, (null) }
Unable to handle kernel NULL pointer dereference at virtual address
00000020

Then the board reboots.

This is issue is happens on the Panda Rev A4 boards, it does not happen
with the A5. Is there any tools to pinpoint the actual cause?