I have a question for the luthiers in this forum. At the beginning of September I got a new guitar (Spruce top, Indian Rosewood back and sides) from Antonio Raya Pardo, an exquisite guitar of great craftmanship. I have posted some photos at another post but I don't think they will be of any help.
I have kept the guitar in it's hard case with a humidifier (room humidity around 60%, steady temperature 20-22 C) away from any heat source whatsoever. I hadn't played the guitar for a week because I was away. When I returned last wseekend I noticed the spruce top below the bridge towards the rim (that is where the top and the side of the guitar meet) had somehow wrinkled, the Surface was no more flat but a bit wavy. the same Thing I notice on the opposite side, that is on the back side of the guitar in the middle and towards the rim (where the two parts of the back side join). The back side has a Kind of curve looking inwards. I do not notice any looseness in the Woods in the area, nor any problem with the glue. More importantly I don't notice any Change in sound. The guitar Plays beautifully exaclty like the first days. Now I don't Claim that both surfaces (top and back) were completely straight, but I have the impression that the wavy surface is now more noticeable. The question is is this common, I mean that the wood changes shape after the guitar is ready, no other factor being involved (misuse of the guitar, extreme conditions). Will the guitar develop any structural problem in the future? I also have a Paulino Bernabe M 50 which has a kind of inward curve just before the bridge, below the strings, but she had that thing from day 1. Again no problem with sound, playability or anything else. Communication with Mr Raya is a bit difficult since he doesn't speak English (through Google translator). Any advice from an expert here would be precious to me.
Thanks a lot for your understanding,