Virtual Piano freezes in MS 3.70

I have been using MS 3.70 for a week or so and discovered a bug. When I activate the virtual piano with the (p") key, it appears at the bottom of the screen and works fine for a while but sporadically, it then begins to freeze in the middle of the song. Its display remains on the last measure played, and clicking on a new note will sound the note and even allow it to be added to the measure, but the piano display doesn't change. It remains on the last measure played.

As a result, I have returned to MS 3.62 (I've hit no bugs at all with it). Please fix as I like 3.70 and would love to continue using it.