Next time it occurs, could you run "notify-send "a" -u critical" a couple of times, which will spawn notifications that have to be dismissed manually, and check if the blocked area roughly corresponds to the area in which notifications appear?
Next time it occurs, could you run "notify-send "a" -u critical" a couple of times, which will spawn notifications that have to be dismissed manually, and check if the blocked area roughly corresponds to the area in which notifications appear?