I haven't fealt any plywood moving, but I did question CC about why the roof material wrinkles at a lot of the plywood seams. They say, it's how they put their roof's on and it's normal. I accept that, but it looks like crap and I don't like it. Every rubber roof I've had before was smooth with no bubbles or wrinkles, no matter what time of year it was. This one wrinkles at the seams. A lot depends on the temp and time of year though, cause it was not like that when I bought it.
As for a fix for yours, hard to say what they would do, or what you should do. It should be secure with no movement. I had one before, still under warranty where 3 screws were coming up through the membrane. I didn't want to go through all the hassle of somebody removing the roof to fix 3 screws, as sometimes fixing a small problem can create others, and all might not go back together and look as good as it did before. On ours, I just cut a tiny hole big enough to get the bit in and remove the screws. I then coated them with construction adhesive and resecured them. Then, put small eternabond squares over the holes and some dicor 501. Never had another problem with it. I know this isn't the same problem you have, but just an idea of how to secure the plywood without removing half the roof. Have you contacted CC to see what ideas they might have?
John and Rebecca Dickson
Emma-7 / Little John-5 / Iva-1
Full Timing Again, Rev B
2013 Ford F-350 Lariat CC LB PSD
2015 SOB TT - With OC's Awning Poles (#8)
At least in Heaven, RVs will be perfect, and I won't have to keep fixing them.