Hello Jeff,
Usually this is due to the wood shrinking in dry environments.
Aside from finding a good balance regarding air humidity (always a compromise between metals and organic materials) and avoiding temperature & humidity fluctuations, I first make sure that the wood is well oiled (at least if not varnished with any natural resin like shellac): Repeat multiple applications over a longer period; make sure though to always thoroughly wipe off excess oil after each application and be careful that the oil does not reach any glued parts/surfaces. Take pics of the marks on the wood to ascertain correct position later.
If nurturing the wood does not help, check whether the bands are placed correctly (kinda obvious - these often get mixed up though!). Then a close examination of the construction may lead to a remediation approach.
However, I prefer to keep the bands as is. If one really needs to secure them, I'd go for any fully reversible option like wax or a tiny drop of certain elastic glues.
Regards,
Kai
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