I also tried changing the timing-settings for polling from the bridge, but I couldn’t see any differences.
My issue was a bit different, but moving several switches and lights from the bridge that had about the maximum number of devices to the second bridge that had only a few devices solved my issue of missed key presses completely.
After upgrade to 3.4.1 my system is running smooth for a few days now.
Will keep track and report here. If everything runs smooth til end of the month I will close th GH issue.
Update: Still working fine 2 days later. Lets see where we get end of the week
Seems like 3.4.1 magically fixed the issue.