About 2 months ago my Echo needed a new starter: At first, it started after being lowered from the tow truck and later after knocking on starter motor--happened three times then replaced starter). Ran fine until yesterday--two months later--now doing the same thing as before: turn the key, everything lights up brightly, one click, doesn't turn over... Tried it again this morning, same thing. Towed it to my mechanic, and it started right up!:(... I did try knocking on the new starter before towing it but it didn't help, and it also has a brand new battery, and ignition switch)

Car is driven every day, no problem, smooth, it's a Toyota. What could it be? Any experience with this?