Lezyne rear lights

Went to ride home from work today having picked my bike up after a service and noticed that my rear light was missing, it is on of the Lezyne micro drive ones that Cycling Plus were giving away, I rode down a poorly maintained road on the way back to the office so was wondering if it could have bounced out of the bracket or is some undesirable had pinched it.
Has anyone else had similar issues with the lights?
Has anyone else had similar issues with the lights?
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Although I've notice that there is a groove on the light that should engage with a corresponding notch on the holder. It makes a very positive sounding snap when you put the light in. Sometimes if you rush it you might not get that nice snap sound and i think this means it isn't quite properly engaged (although it feels it) and so it may vibrate out over bumps! Fortunately I noticed and went back and retrieved it. The light case was a little chipped but nothing more drastic.
Absolutely awesom rear light apart from that! Not bad for nowt.
Cheers,
+1 to that. It needs to be firmly pressed right up against the housing and make sure it's correctly slotted into the groove. So far I've not had a problem despite hitting a crater on last ride!