If a new place, I would agree with Rag ****** - let the warranty folks know you have a problem. Not sure what causes it. I've seen it in homes and hotels both new and quite old. What I sometimes have done is after a shower and with the water valve still off, just open the shower diverter valve just a bit. That only works with the tub/shower arrangement of course. Anyway, by opening the shower diverter it lets the shower supply pipe drain and the water that is in the shower head drain out. Kind of a pain but it's a lot cheaper than paying someone to replace the valves in the wall which might not solve your problem.
If a knowledgable plumber here can offer a good and fairly cheap long-term solution, I would like to hear it. Until then, just drain the shower pipe a bit after each shower. At least it won't drip, drip, drip. . .
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