3 points.
1. Welcome to the forum. It's a great place with great people and lots and lots of info for your car.
2. It's normal for it to take longer than 5 minutes for someone to reply. I would normally wait 2-3 days before bumping it.
3. On to your actual problem, I would check your battery terminal rings. My car would do this from time to time, and I discovered the cause was that the rings were actually worn out and split, so that they weren't ever as tight as I thought they were. I ended up buying some crappy ones from Autozone, mangling the originals to fit, and then putting those on the battery, which looked hideous but did the job without a hitch. What kind year/model do you have? Have you ever had any other electrical/starting issues?