HTC India — Htc desire 620g facing wifi connectivity issue

Hi,
The mobile was connecting to wifi from a year, and suddenly it has stopped connecting to wifi. The available wifi networks can be viewed on phone, but its not connecting to the wifi, after the providing password, its failing to connect (Shows message like-saved, secured with wpa). There is no problem with wifi router as its getting connected on other devices.
Please help me resolving the issue.
Thank you