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  1. I’ve had this problem for the last few weeks, even if I shutdown my phone the ma still won’t shutdown or reboot, only a hard reboot works. No idea how to stop this from happening.

  2. Had the same problem. Only a hard shit down was possible. As described above. Iphone was hanging in Music/ITunes and I could not eject Iphone. Onle a hard shut down was possible.
    Do you know if this prouhS finally be fixed?

  3. I’ve had the same issue when shutting down my iMac (2017) with Big Sur 11.0.1 always says can’t because of the ios device syncing when in fact I don’t have my phone connected to my iMac nor do I use iTunes that much. Already knew about force quitting etc, Did it restarted my Imac and the four AMPD agents showed up in Activity Monitor. The phone did show in the sidebar of the finder window when not connected and ejected that some time ago and always thought that might have caused the problem. When all else fails I’ll use the power button.

  4. I’ve had this problem since “upgrading” to Catalina. It persists even after I’ve powered-down all iOS devices and after following the syncing steps described above. I’m not an expert by any means, but I’ve tried obvious trouble-shooting steps (e.g. disabling malware software). The only thing that works at the moment is powering off using the power switch. I’ve reset the SMC but don’t know if it helped. I’m getting tired of Mac OS Catalina emulating a bad version of Windows.

  5. AMPDevicesAgent is the process responsible for syncing iOS devices.

    If all else fails, and the iOS syncing process seems to be hung, open Activity Monitor, search for AMPDevicesAgent.

    Two process should appear, the process and the helper agent. Highlight both of them and select the X on the far left top of that window. Then select Force Quit. Wait a moment. You may have to do do this once more.

    You should now be able to restart your Mac!

    1. Yeah! Thank you this worked. Driving me crazy. I removed my iphone from the location section of finder on the left first thinking that would help but now it won’t connect. Oh well at least it shuts down

    2. that only thing worked with me. but not AMPDevicesAgent only.
      you should search for AMP and 4 of them will come up, force quit for all of them . then you will be ready to go.

      1. Thank you. I didn’t realize there were 3 others I had to force quit and it worked for me. I just had to relaunch Finder afterwards before being able to shut down.

  6. Thanks, MacReports! I went with item 4 in your options to un-hang the iOS device sync process (appeared as AMSdevicemanager or something like that, using 99% of CPU cycles).

    Not being familiar with the quit function of Activity Monitor, it took me a minute to locate the QUIT icon (The ‘X’ button in the top left of the window), and I tried simple quit on the confirmation dialog the first time, to no avail. On 2nd try, ‘force quit’ worked, as you originally directed. The sync process for my iPhone cleared from the default new finder window sidebar, and I was able to click the eject icon to clear it off Finder.

    As another commenter said, critiquing iTunes ‘breakup’ — whatever that is — it seems iTunes/Music keeps getting worse with every new update, that trajectory being one reason I increasingly move to another, streaming, music library rather than try to keep re-figuring out how iTunes (now Music) is organized (poorly!). If Music would focus on being a good, intuitive library for music I already own, I’d spend more time using it, less time using competitor’s streaming services. If Apple wants to compete on streaming, do that in a different app and provide ports between the two. And don’t break core functions of the Mac / iOS ecosystem while you rearrange the deck chairs in iTunes/Music.

  7. Hanging iOS device sync? Hard restart your whole computer. Great apple, huge step back. Breaking up itunes was supposed to improve reliability, not make failures even more catastrophic.

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