Anyone have any issues with the wing tanks turning loose? On my 4, it appears that both wing tanks are moving around a bit causing pinches in the fabric. I can flex the wings when they are folded and see movement between the spar and the tank. Maybe the silicone has let go? Any ideas on how to remedy this without recovering? If recovering is only option, has anyone repaired by only removing the fabric on one side of the wing? Is this an airworthy issue.