I had an issue with the cadence on the first couple rides with mine. p2m support instructed me to clear all my saved sensors off the garmin and add the p2m back on first. I have not had the need to use any of my other cadence sensors since then but It has been working flawless since using it on my mountain bike and gravel bike for the past 8 months. Maybe the same trick will work for your power drop outs.
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