When the update dialog show up read the full text. It sounds like a device firmware update, which takes some take, is done in the background and then restarts the device.
It can be the case where you have many pending Firmware updates and you need to do them all…
More information about firmware updates here: https://www.drivemodedashboard.com/support/faqs/?Display_FAQ=9025
DMD2 Project Manager & Lead Developer
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