Fenix 7 pro SS firmware bug or display defect

After purchase I updated the firmware to version 16.22. A couple of hours after this, I noticed a horizontal strip on the screen just slightly below the middle, and then the lower part of the screen seemed to begin to freeze, while the device itself did not freeze, but the frozen part hangs over the lower part (as in the first photo). After reading the forum, I downgraded firmware to 15.77, but after a couple of hours everything returned. It’s strange that after a reboot the strip appears immediately, but after changing the watch face everything is ok for a while.
This situation was with firmware 15.77, 16.22 and 17.12.


Is this bug or display defect? That`s my first Garmin experience