Door Latch problems of the 2005 Toyota Prius

The contact owns a 2005 Toyota Prius. He states that while driving every warning light in the vehicle began to flash, then the car died. He turned the vehicle on again and it done the same thing. After this the vehicle would not start. He called Toyota ,they sent someone with gas because the add fuel light was flashing, and they put gas in the vehicle. It still would not start. Towed to Toyota dealership, they looked at the car and could not get it to start. Someone kept pressing buttons and got the car to start, then, it started every time. The next time while driving with a full tank of gas it went from three quarters tank to gas down to empty instantly. He immediately pulled into a gas station to get gas and the maintenance light was flashing. He called Toyota back, and they would tow him to the nearest Toyota dealership. Instead he drove the vehicle home. Dealership said they did checked the fuel lines and it should be fine. Toyota denied all problems with the cars, the individual who towed consumer's vehicle told him that they had several people with this same problem. He decided to trade in the vehicle because he did not feel safe. It had several electrical problems such as, high beams came on by themselves, and door locks would not open occasionally. These incidents occurred on may 1, 2005 ,and he traded the vehicle in on may 16, 2005 . It was in the shop three times.