my V50 doesn’t recognize the ignition keys anymore

Hi, wanted to start again last night, keys turned upside down and NOTHING! On the display the message of wrong keys appears again. Again nothing tries. I then up and got the second key also the did not work. The car open and close but works without problems. I then called the Volvo Assistance, had my V50 to be towed to the friendly and a replacement car (Seat Leon 2.0 TDI ). The type of towing service said it was the I bought the V50 in March 2008 . Since then I had to have the car to be brought in three times because nothing was going on. Three times I was in the workshop because there were defects at the engine. This was all repaired on warranty. But it can’t be that the car has so many problems in such a short time. I think about repelling the Volvo and switching to Volkswagen again. There had to be an immobilizer . Electronic problem. What do you think??