if the boot lock continues to stick.....take it off by removing the boot plynth via the 4 screws underneath then go inside the bootlid from
behind the plastic panel inside and carefully squeeze the sides after you have unclipped the mechanism lever (easier on looking)
then prise out the circlip on the back of the barrel. The barel will drop out. now methodically remove the key pins inside and place them in
the order you took them out. clean them all and the barrel and the plastic lock holder, re grease putback togther and it will be mint for many years
to come.
as for running hot as already metioned its fairly common in traffic situations..
dan