I had an issue with the hatch actuator on my 08 V338 last year. When getting ready for the season, my hatch would sometimes open and other times it would not. I was not connected to shore power as the boat was still on land. I checked the house batteries for proper charge levels and found them to be fully charged. I next checked the wire harness and electrical connector. What I found was one of the wires on the actuator motor was loose. I replaced the connector and my actuator has worked fine since. Perhaps you have the same issue.
_________________

2008 V338
Twin Volvo Penta 320hp DP
2002 268 Vista
1987 225 Sundowner
1986 170 Horizon
1975 Steury V415SS