Hello. I have an Eagletac D25C Ti clicky that I've had for a little while. Really like the light (size and output), but it has become unreliable. Sometimes it comes on, sometimes not (without banging it on something solid). Sometimes when it does come on it flickers, or goes back off. It hasn't changed modes properly in a while. I have no need for a flashlight that doesn't come on every time I click the button, so before I toss this one and get something else, could someone help with possible causes and how to fix them? Thanks.