Zinsco circuit breaker panel issue?

in the past few days some electrical power in 3 areas (with different circuit breakers but sit next each other) have gone out and later come back on their own. Sometimes lights will blink or flicker at times. In other words, the failure is intermittent. It is either very brief or longer lasting -- even for days. If there is blinking, it would be instantaneous (a fraction of a second) and might or might not be related to heavy appliances turning on or off. Any flickering would be irregular or jagged (not rhythmic) and might go on while. Do anyone know how to fix the problem?