Windows 10 PhoneExperienceHost.exe high CPU usage when pc idle

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J{{{{{

Hi,When I come back to my laptop and it's gone into idle mode (screen off) I can hear the fans running fast, but as soon as I move the mouse the fans die off. I tried to figure out for a while what was happening and eventually set up perfmon to record what processes were running. I discovered that runs at 50% CPU continuously while the machine is in idle which is ridiculous for something that shouldn't be doing anything much (I'd upload a screenshot but there doesn't seem to be an option anywhere). Looking at details in Task Manager the PhoneExperienceHost.exe process has used twice as much CP

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