My 97 Honda Accord SE 2.2l L4 has problems starting sometimes?

If I leave the car off overnight, or after it's been sitting for a few hours. It'll start right up. If I drive to the store, go inside for 15-20 minutes, come out and try to start. You can hear it click, but it doesn't start. After a few turns it usually starts up, but it's gotten worse at times, had to try for about 20 minutes until it finally started. It's making me worry thinking I'm going to be stuck somewhere. Do you guys have any idea what it could possible be? (I checked my battery, and it's fully charged. Starter is good, just got a new ignition switch and my alternator is good as well) my battery terminals are brand new too.

There's a tool for re-cutting both the battery terminal clamps and the battery posts.
not expensive but very useful.
more so with Asian cars,
for some reason?
Anyhoo,
ten min's spent with this tool will probably improve the situation,
Unless one or more of the clamps is past it,
simple test is can you twist the clamp round when it's on the battery?
if you can it's shot.
I'm at the stage that when one like this comes in most times I start by renewing the terminal clamps,
it happens that better than 90% of them have faulty clamps.