cv axles and thermostat

i just got this mx3 two months ago and about two weeks after buying it the cv axle went out, no big deal got a new one put on, but within the past week it started making the same "clicking" sound it was making... so what the hell would make it go out again so fast? also i put a new thermostat in it and within the week its not really working... any suggestions? :confused: :confused: