Small Engine Troubleshooting Problems? Ask a Mechanic Now.
Gas cart? Or electric? Warranty?
If gas, does it loose spark, by checking for spark with spare spark plug attached and grounded?
You can check for spark when it quits, and if no spark, it likely needs new coil!
There are two dealers in Austin. Have you tried them?
Golf Carts of Austin, In Buda, would be worth a phone call.