The only time I've experienced the 3 beeps is when I've pressed the close & lock button without the key in my pocket; if you're certain that you've always had your key about your person when the fault occurs then it suggests to me that there's a problem with the keyless receiver at the back of the car or the key itself, which could also explain the lack of foot swipe activation.
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Current - 2017 V90 D4 Inscription
Previous - 2011 S80 D3
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