If you unplug it for longer than, I think, 15 minutes, the computer should reset to default mode. It shouldn't restart in jig mode. Sounds like the programming has gone glitchy, or the throttle position sensor has gone bad or disengaged from the lever. In any case, send it in for service.
The last time, I sent mine out to California. But it looks like the new Miami location is open now. I'd give 'em a call first. From the Daiwa website:
Exclusive Dendoh Power Assist Reels Warranty Service & Parts
Reel and Rod Services, Inc.
14645 SW 42nd St.
Miami, FL 33175