Sounds like the first hint that the starter contacts are starting to go.
Just make sure your + and - battery and starter wires are secure and have good contact before tearing into the starter.
It's not hard to change the contacts - once the starter is out.
It's getting the starter out that's the PITA <img src="/forums/images/graemlins/shiner.gif" alt="" />
Hope this helps,
Todd

1986 Pickup extracab longbed "Woody edition"
SAS - 33's, 5.29's, lockright rear.

02 IS300 SportCross - my "DD"
94 2wd v6 extracab
04 Outback Wagon- wife's/family car