sernsorservice and unity consuming cpu

Just pulled my phone out of the bag and it's hot. Looks like sensorservice has been chugging away for some time.

top - 23:55:21 up 17:34, 0 users, load average: 2.50, 2.55, 3.84
Tasks: 195 total, 1 running, 191 sleeping, 3 stopped, 0 zombie
%Cpu(s): 4.2 us, 23.7 sy, 0.0 ni, 72.1 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
KiB Mem: 1916236 total, 1519212 used, 397024 free, 6096 buffers
KiB Swap: 102396 total, 102316 used, 80 free, 97120 cached

  PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
  596 system 20 0 8060 156 0 S 97.9 0.0 36:39.69 sensorservice
  641 phablet 20 0 440m 312m 2856 S 11.1 16.7 109:57.90 maliit-server
27084 root 20 0 2480 1084 712 R 1.3 0.1 0:01.31 top
  577 root 0 -20 6596 16 0 S 0.7 0.0 9:00.49 mpdecision
  445 root 20 0 37812 336 156 S 0.3 0.0 0:09.92 adbd
    1 root 20 0 3240 1312 516 S 0.0 0.1 11:56.21 init

Seeing this again today on image 180.

  PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
  719 system 20 0 7020 1580 1224 S 98.4 0.1 1:54.67 sensorserv+
 2019 root 20 0 2556 1100 732 R 1.0 0.1 0:00.63 top
  123 root 20 0 0 0 0 S 0.7 0.0 0:01.38 mmcqd/0
    5 root 20 0 0 0 0 S 0.3 0.0 0:00.16 kworker/u:0
  716 root 0 -20 6572 556 408 S 0.3 0.0 0:01.44 mpdecision
  810 root 20 0 0 0 0 S 0.3 0.0 0:00.04 kworker/1:0

On image 192 I'm seeing sensorservice at 100% along with /sbin/apparmor_parser.

It took a full 7 minutes from boot to getting unity running. Majority of the time it was sat at the Google logo.