hi and welcome to GoY. the scientific name for your shrub is Leicestra Formosa and is usually tough as old boots.

has it been recently planted? if yes then you need to give it plenty of water to help it establish. if you haven't had much rain then this may be the cause.

if well established it could still be drought related. as for flowers when did you last prune it?

sorry about the questions but these will help give you a better answer.