What is another word for become troublesome?
Pronunciation: [bɪkˌʌm tɹˈʌbə͡lsˌʌm] (IPA) 
There are a number of synonyms for the phrase "become troublesome." One common alternative is "become problematic," which can convey a similar sense of difficulty or challenge. Another option is "become thorny," which suggests a situation that is difficult to manage or navigate. "Become vexing" is another synonym, which suggests frustration or annoyance. The phrase "become a nuisance" can also be used, indicating that a problem has become persistent or bothersome. Other possible synonyms include "become irksome," "become bothersome," and "become a headache." Each of these phrases can be used to describe a situation in which a challenge or problem has arisen and must be dealt with.
