This happened to me as well a bunch of times and it turned out that my phone and fob were to close to each other...when they are in separate pockets, it always work...could that be the problem?
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2010 BMW M6
2007 BMW 335i,2012 Audi S4-retired
2016 BMW 750i M-Sport
2015 BMW M235i-retired, 2022 M240i
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