I just went a couple days without a single instance of this, but just encountered this again on the first flight after the 1.19.9.0 update. However, with the added bonus of the ATC menu items being grayed out with all ATC chatter ceasing for the duration of the flight. I’ve submitted a bug report to Zendesk
UPDATE: Workaround to grayed out menus: Clicking on one of the other COM tabs (COM2 or COM3) in the ATC menu then back to COM1 caused the menus to become active. However, still a one sided conversation with ATC