Full code: STOP: 0x000000F4(0x00000003,0x8913EB50,0x8913ECC4,0x805D2954). The only consistency is that it is usually fairly soon after start-up, but not all the time. Incidents are increasing in frequency and very worrisome. Requires power off and restart
to recover but so far always restarts. What is the problem and how do I fix it?