Garmin has become BAD

I have a Garmin Nuvi, and last year I had to take it for repairs X2. Each time it works for a while and then blanks. I have contacted Garmin in January 2015 and till today all I get is buy a new one. I DO NOT want to buy a new one I want my one to be fixed, and That is where we are. I ask and Garmin just do not respond anymore. I have lost all my trust in Garmin.