ANSWER: No, one doesn’t have to do istinja when they break wind. They simply have to renew their wudu before praying.  Doing istinja after breaking wudu due to passing wind is an innovation. 

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ANSWER: No, this is not a must.  You can wash it once, twice or maximum 3 times.  https://www.assimalhakeem.net/how-to-do-wudu/

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ANSWER: No problem in speaking during wudu but you must not go for answering a phone call or door bell, or do some chore and come back during wudu, this is not permissible. 

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