Thanks whynotthinkwhynot. Hadn't thought of that.
Key fob issue - It probably isnt this as this would probably run down the battery on the key? The battery life has been pretty good - 1 yr plus. I do have 2 keys though so I will test with the spare.
Trunk button - This is probably more likely. I will see if there is anything obviously wrong with the button. Will probably have to drop it into the garage to have it checked.
Thanks for your help