I'm running F-21 on two revisions of the Panda-ES without issues. I'm
running one with a minimal install and one with XFCE.
I've not seen any errors around thermal errors even when compiling
things. Have you tried installing the kernel-tools package and running
the tmon util? My devices sit at around 30 degrees at idle.
The wlcore module error is a known issue. I black list them as I don't
use wireless. The chip needs a userspace util called uim to put the
chip into the right mode, also the patches to support DeviceTree
haven't landed upstream. In general the WiLink wireless drivers aren't
in a great state.
I create a file called:
/etc/modprobe.d/blacklist-wlcore.conf
And add the following two lines:
blacklist wl12xx
blacklist wlcore
I can't help with the other error without more information. Overall
with F-21 GA the Panda-ES does work relatively well in my experience.
There's certainly some improvements to be made but it's generally very
usable with XFCE or as a minimal install system.
Peter