Comment 2 for bug 1523308

This is quite likely a duplicate of Bug #1493574 that I just noticed. That bug suggests attaching powerd logs but this just happened, Dec 7th, and I don't seem to have any relevant powerd logs:

phablet@ubuntu-phablet:~$ sudo ls -lh /var/log/upstart/powerd.log.*
-rw-r----- 1 root root 545 Dec 2 12:40 /var/log/upstart/powerd.log.1.gz
-rw-r----- 1 root root 609 Nov 29 15:13 /var/log/upstart/powerd.log.2.gz
-rw-r----- 1 root root 633 Nov 27 23:11 /var/log/upstart/powerd.log.3.gz
-rw-r----- 1 root root 1.4K Nov 26 13:28 /var/log/upstart/powerd.log.4.gz
-rw-r----- 1 root root 795 Nov 22 18:09 /var/log/upstart/powerd.log.5.gz
-rw-r----- 1 root root 88 Nov 20 14:36 /var/log/upstart/powerd.log.6.gz
-rw-r----- 1 root root 771 Nov 19 19:53 /var/log/upstart/powerd.log.7.gz

To answer the other questions there, this is an MX4 so there's only one SIM card, and this might be the only time it's happened (I don't often make voice calls on this phone).