Nowadays many chips, especially CPUs for portable devices can decrease the clock speed or even suspend for short periods of time to save power. This is great.
Now when a chip reduces power consumption it dissipates far less heat and cools down. Typically a device executes commands in bursts. You start a heavy app and the device's CPU runs on full load for say 15 seconds and warms up, then you might use the application without triggering its CPU-intensive functions for a long period of time, then the CPU load decreases greatly and power saving mechanisms supsend or downclock the CPU and it cools down. Then you trigger some CPU-intensive function, the CPU runs on full load for 10 seconds and warms up, then cools down.
Does frequently warming up and cooling down a chip in the manner described above have negative effect on the chip lifetime?