Did it again today. Getting more frequent now.
Answering my own question here. It looks like it's a boot lock problem. If I thump the boot just below the plastic trim that hides the switch then the boot will unlock.
Seems I'll have to take the trim off and have a look behind it to work out what's wrong. Hopefully as its intermittent it'll either be a loose connection, or the boot lock requiring some lubrication. Fingers crossed.
Answering my own question here. It looks like it's a boot lock problem. If I thump the boot just below the plastic trim that hides the switch then the boot will unlock.
Seems I'll have to take the trim off and have a look behind it to work out what's wrong. Hopefully as its intermittent it'll either be a loose connection, or the boot lock requiring some lubrication. Fingers crossed.