I love my car but as it is my first one with automatic transmission I am a little in the dark about some aspects of driving it. I do not use it very often as I only go out occasionally which may or may not be relevant to my problem. Occasionally I have had to accelerate a little for it to go into reverse. However this week I just could not get it into reverse. The drive and park have never been a problem. I kept trying to reverse and in the end put my foot down to accelerate and it clunked into the reverse gear and shot backwards. I later had to reverse while out and there was no difficulty. Could it be something sticking through not being used every week?