reluctant

Sometimes when I close the bonnet on my 1.4 the catch won't work, and it's just held closed by the little release lever under the lip of the bonnet. It only seems to happen when the engine is hot, so I think that the metal is expanding which makes the catch stick. Is this a common problem...

Been happening for a couple of weeks now, just wondered if anyone had any ideas? Engine turns over, sluggish, then starts up. Sometimes it obviously isn't quick enough though, and the TCS doesn't engage, resulting in that warning light being illuminated on the dash. Battery levels seem...