2004 Odyssey left turn signal locks up (indicator on instrument panel) after van has been running for longer than 10min. When checked in the drive way all functions ok walk around all lights flashed normally. Now right signal doing the same. Also radio back light is starting to blink while turn signal in toggled on to signal but flasher indicator stays solid on (locked up). I have checked two relays in the enginge fuse box no signs of corrision. It seems to be a heat related issue? Could the flasher relays have arc'ed? Is there one or two flasher relays?