Q: keynote remote (on iPhone 5) keeps reporting "connection lost"

I use Keynote on my iPad to present lectures, and Keynote remote on my iPhone 5 to advance the slides.  But occasionally, Keynote remote operating on the iPhone will show "connection lost" like this:

I tap OK and within a few seconds it usually reconnects without me doing anything.  Occasionally it won't reconnect no matter what I do.  Most of the time I have the two devices linked via personal hotspot because no WiFi networks are usually available in the rooms where I give presentations.  Both devices still show the chain-link icon, indicating that the hotspot is still running and the iPad is connected to it, so it doesn't seem like a problem with the network.

This has been an issue only since I upgraded to iOS8 (and upgraded the Keynote versions along with it) a couple months ago.  Prior to that I never had this problem.  Of course, before iOS8 I was using the stand-alone keynote remote app from the app store, which isn't available any more.

I supposed there probably isn't anything I can do to fix this, but I wanted to log the issue here just in case anyone else was having this problem.