旧病复发

舊病復發
jiùbìngfùfā
  1. old illness recurs (idiom); a relapse
  2. fig. to repeat an old error
  3. the same old problem

CEDICT

Entry Composition

1 旧病 jiùbìng
  1. old illness
  2. former affliction
2 复发 fùfā
  1. to recur (of a disease)
  2. to reappear
  3. to relapse (into a former bad state)