KA: Four-year limit?

Hello, my Ka Futura EZ 05/01, 55,000km, has recently developed a preference for workshop stays, needed e.g. completely new brakes, now the compressor of the A/C has broken and the axle cuff is marode, so should be renewed soon. Besides, the little one starts to rust slowly, e.g. at the window buttons. Does this go on and on now? I’m not really so willing, every year beside the costs of wear parts (tires special size!) still 500-70 0 € for workshop costs. What are the experiences?