Watch is broken

Hi, i have bought an Instinct solar one year and two months ago and all of a sudden it no longer functions. Anytime i go and start an activity, or a message comes through  the watch just shuts down. Sometimes out of the blue it shuts down. I took it to my official support in my country Uruguay, and they tell me that it is a motherboard problem and that because it is just two months out of warranty the can do absolutely nothing about it. This is really frustrating because i did not damage the watch in any way, and just two months after the warranty is over it is useless and they can do nothing about it. I really wish garmin had better customer support than this