I seem to have fixed it, some forum somewhere had some info, it's due to overheating, so I downloaded smcFanControl and upped the min CPU fan speed from 1000rpm to 2500rpm, seems to be ok so far...
@turnpedal started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
I seem to have fixed it, some forum somewhere had some info, it's due to overheating, so I downloaded smcFanControl and upped the min CPU fan speed from 1000rpm to 2500rpm, seems to be ok so far...