P10 or the Dock making a audible clicking sound when in sleep!

I've noticed that the P10, when docked, and just as it falls asleep (lights off, app showing "Z..Z...Z"), it starts to make this steady clicking sound.  The sound goes away as soon as I wake up the unit.  What is the cause of the sound and what steps can be taken to fix it?  (Tried to upload a video with sound, but 'Attachment' dialog shows invalid video format (iPhone xxxx.mov file)!)

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Additional data point:  Apparently, the clicking eventually stops.  This only occurs minutes after I quit the Mova App on the phone or on the Mac.  When I relaunch the app, the clicking comes back.

Please make sure the charging terminals, docking ports and auto‑water refill port are well‑aligned when the robot returns to the dock. Precise contact is required. If docking is not perfect, the robot will leave the dock automatically to readjust its return‑to‑charge path.
Besides, some friction noise during docking is normal. We have increased friction between the drive wheels and dock stand to improve the overall docking performance.
You may open the Movahome APP, go into your device page, tap the three‑dot icon at the top‑right corner and enter Settings. Scroll down to Firmware Update and check for the latest firmware, which helps optimize docking performance. We also recommend turning on Auto‑Update so you can always get the best‑performing version.
If you hear abnormal noise that differs from what is described above, please send us a private message with your device SN code and a clear video that captures the noise, and we will assist you further.