It happens to me too — very occasionally, but has done at least twice in the past week, as far as I can remember (on an M1 Max running MacOS 15.3.1). The Help search box suddenly becomes very unresponsive, taking a couple of seconds to register each keypress before sluggishly responding.
There is the (probably unrelated) problem that, for me, still occasionally affects makes either Help or the Formula Workshop unusable, which was discussed in this thread in 2022.
In all these cases, closing and re-opening the database concerned (Help, Formula Worksop, etc.) has almost always fixed it. Very occasionally it has been necessary to restart Panorama too.
In the last few weeks I’ve has a few random occurrences of a Text Editor object in one of my own databases suddenly refusing to register any keypresses (without, apparently, having lost focus), sometimes fixed by switching to another application then back to Panorama, but sometimes not. Again, that’s probably unrelated and due to something I’ve changed in my own code but, like the above, it’s one of those problems that’s too rare and seemingly random to make it easy to work out what the trigger might be.