Bought two; one has stopped working and the other has a short in the wire.

I bought two of these for my tortoise table. Received them not even 3 weeks ago. And in that 3 weeks I don't believe I've had both working at the same time after the first day. One is completely gone, I'm assuming some kind of wire issue because I put known working bulbs in and nothing. The other is on the same path I imagine as the other one. It'll stop working but if you gently tug on the wire the light flickers on and if you do it just right the light will stay on... how much longer till that one is dead too? Wish I wouldn't have spent my money on these.

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