Since the problem occurred both yesterday and today, I've attached both ride files for your review. BTW: I replaced the iBike battery this AM before the ride and the HR sensor battery tested 'good' with my battery tester.
The HR problem has happened on other rides too and needless to say it mucks up the numbers. In the 8/23 file, HR starts @ 50bpm (I'm not lying in bed

Your thoughts? Any ideas how to fix this?
Thanks in advance.