Question

why Gandhiji relaunched civil disobedience movement?

Answer 1

In December 1931, Gandhiji went to London to attend the Second Round Table Conference, but the negotiations broke down and he returned disappointed.
ii Back in India, he discovered that the government had begun a new cycle of repression. Ghaffar Khan and Jawaharlal Nehru were both in jail, the Congress had been declared illegal.
iii A series of measures had been imposed to prevent meetings, demonstrations and boycotts. With great apprehension, Mahatma Gandhi re-launched the Civil Disobedience Movement. 
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Answer 2

gandhiji relaunched civil disobedience movement because of the increasing rude attitude towards indians