This happened 4-5 times on my 2008 S40. I noticed it only happened when I had a front passenger or cargo in the footwell (and once after an interior valet) which led me to think someone/something disturbed an electrical connection in the CEM. Each time I would just reach underneath and ensure the wiring loom leaving the CEM under the carpet was firmly in and it would start every time. Covered 40k+ miles since last issue.
I realise this isn't a particularly technical solution but maybe worth considering that it's not the CEM, and possibly a wiring loom connected to it that needs exploring?
Hope you get it sorted.
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