CEM overheating is an issue that plagues the P2 platform in hot weather, it wouldn't surprise me if the same happened to these.
When the weather cools down a bit, fire the car up and point a hairdryer at the CEM on low (not for too long!) and see if the symptoms return. A common mod to do on the P2s was to install a cooling fan on the CEM case, not sure if you'd be up for doing this on a newer model though.
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Current - 2004 Volvo V70R Titanium Grey - 67k
2008 S60 2.0t Sport Electric Silver - 156k
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