Solution :
a). The suspect may experience some emotional changes that are not necessarily due to a scandal or scam. We need to establish that the proper figures and facts are to be analyzed before reaching the conclusion. But however, the primary conclusion is that something is going on on the suspect's mind that needs to be further dealing. (2) increment in the income needs to be validated and also proper root cause of the changes should be analyzed.
b). No from the above facts we cannot conclude that the suspect had committed financial frauds. For this a full proof validation of the facts and the evidences are required for a solid conclusion for helding the suspect for committing financial frauds. Hence further investigation is needed for deriving a conclusion.