What is the fix for an Odyssey that is having problems going in to reverse? on 2006 Honda Odyssey

The reverse on my Odyssey will work for a period of time and then won't. Then all of a sudden out of the blue it will work again. I took it to a transmission shop and they checked for error codes, but there was none. The shop suspected that it might be an electrical problem, possibly something with sensor. Any ideas?

Asked by for the 2006 Honda Odyssey