wifi not responding.,battery hot -discharged fast,unable to start

hi

my tab s is 6 months old .never gave a problem.

all of a sudden the unable to connect to wifi ,and battery became too hot..

tried to reset the tab s ., after resetting battery drained very fast and when tried to charge ---not charging up and unable to power up the ( start) the device..local mechanics said it is the problem with the battery/ mother board..please suggest me the solution..( brought the devise online)