1. ONT gui fix 40MHz (in CH.9) but inSSIDer 4 display only 20MHz (not display 40MHz or not switch between 20MHz and 40MHz).
2. In same environment, Same unit in other channel (CH1~8 and CH10~13) also switch between 20MHz and 40MHz frequently.
And the result of Omnipeek to capture ONT Wi-Fi I will tell you after test.