What triggers the prompt for memory test during boot up of WLC.

I have a controller that sometimes does and sometimes doesn't prompt for memory test at boot up. What triggers the prompt for memory test at boot up?

We have the same behaviour with a 4402 controller.
After a software upgrade from 4.2.130.0 to 4.2.176.0 the controller didn't reboot automaticly during the first restart with the new software. I connected via console and saw this message:
Airespace 4200 Wireless LAN Switch Board - Memory Test
Invalid Option...Press any key to continue
Airespace 4200 Wireless LAN Switch Board - Memory Test
1. Restricted [4kB per MB]
2. Entire Range [512M]
3. EXIT
Then I choosed option <3 Exit> and the controller started correct.
Regards
Hendrik

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