Not really every few minutes. More like every 15 minutes :p You can set it to auto kill every x amount of minutes, which will solve the problem :)
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I think that's how it works on Android by default. I've noticed this with any ROM since I first used Android. I just kill them with Advanced Task Killer.
Apart from the two bug fixes (About Phone and Network Operator Selection (for which I am really grateful for)), this ROM still leaks RAM like a mofo :( and the lockscreen issue is still there.