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There's a couple of different issues that cause similiar things here I think.
1. I've only read about this so I don't know how valid it is but I'll pass it on since I haven't seen it mentioned... On newer cars with the MOST fiber optic bus system, the radio sometimes loses it's ability to send data to the amp. The radio will look like it's working fine (display lit, etc) but there will be no sound output. After shutting the car off and restarting after 10 minutes everything is back to normal. This has happened to me once. Supposedly, there is a TSB on this and Porsche will replace the amp.
2. There is usually some kind of air/idle control valve that regulates the idle on most cars. If the car wants to die between shifts this sounds like it could be the culprit. Other symptoms include erratic idle while stopped and/or erratic idle after turning on the ac. I'm not too familiar with the Boxster yet but this has happened on my other cars and I'm guessing the Boxster works in a similiar fashion.
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