chooka, this has never been a problem with the Maton CW80's I've owned over the past 35 years. Haven't seen it in others either. And I've seen some that have really taken a hiding ! For example the M325 [ same neck as a CW80 ] has been dubbed "The Road Warrior" for it's ability to withstand punishment with bands on tour.
When you say a bow , is it way over about 3mm on the 6th string & 2mm on the 1st at the 10th fret ?
Do you live in a climate that changes in humidity rapidly or take your guitar from an air conditioned room to the car on a regular basis ?
I agree that Maton should take your guitar back to the factory and give you the VIP treatment if it's changing radically on such a frequent basis without any climatic reason.
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