HTC — Problem in connection of wifi

Address:

Coimbatore, Tamil Nadu

1.i purchased my htc526g+
on 9th November 2015 .from the day itself my Wi-Fi was not connecting I gave it servicing at your authorized service center at Coimbatore. I got my phone only after twenty days but them I am again facing problem like Wi-Fi is not connecting, dates and times are changing on its own, problem in Connecting hot-spot while using shareit