No need to apologize, I'm thankful for the work you've done to improve my Elektron experience so far (SDS drop is the bees knees).
I can reproduce the crash by simply hitting record while in the sample view, then hitting the back button while recording is active. It causes an instant freeze. I can close the app and restart to get functionality back, but often graphic issues appear.
As for the other issue, I do the following:
Tap the src/ptn button in strom, then tap an unused performance macro. That allows me to control the FN button with the macro (that's what's supposed to happen right?). This works for a few seconds like a momentary button (when macro is pressed, FN is engaged, when macro is released FN disengages). After a moment, FN starts to behave like a toggle switch for a few seconds. After a few more seconds, Strom stops communicating all together until restarted.
If it would help, I could make a video clip to show the issues in action. Just let me know.