Intermittent?

When fiddling with the split mode on my FT817ND I noticed no antenna current on 472kHz from my transverter. When I went back some hours later I checked the 3.2MHz oscillator was running by listening on another rig - it was. To my relief the antenna current was normal. Then it disappeared again. My brain was too foggy to investigate, but it looks like an intermittent in the antenna matching. I shall investigate tomorrow and make a few soldered connections.