02 Odyssey maint reqd flashes once and radio reception interrupted

Had an oil change on 02 Odyssey yesterday; this morning, as I was driving the maint req'd light flashed on and off and the radio reception was interrupted for a second. This happened twice in a row within a minute. I was almost to my destination, so I parked, turned the car off and when I came out an hour later, the clock had reset itself and the radio was asking for the code. We just replaced the battery a couple of weeks ago. Any thoughts? Thanks!