Q: After working for a couple years with no problems my focusrite 2i2 has stopped working with Logic Pro X.

I'm using a 2012 Macbook Pro, and an older Focusrite 2i2 that I've used for a few years.  This setup has worked for years but recently I've had some problems.  Occasionally the Focusrite is recognized as both an input and output audio device and everything works recording wise.  But, now more often than not, I get a message that says my previous audio device could not be found, my focusrite only shows up as an input and doesn't allow me actually record any input.  Sometimes my device shows up as an input and an output and everything records, but this seems to happen less and less these days.  Has anyone experienced this, or have an idea of what might be happening/how to fix?  Thanks so much!!!