Well, it is a possibility that since you didn't have string tension on the guitars neck that the truss rod warped a tiny bit, causing the bridge to fall from its floating position. This is common with people that tune their guitars down to drop D or C when their guitars are setup for standard tuning. Also, it's a common misconception that if your guitar is going to sit for a long time you should relieve the string tension.... well, you can see what happens when you do that. The warping may be just slightly (maybe less than a millimeter). Instead of relieving string tension, you should always relieve truss rod tension. If the wood is going to warp, you want it to warp in a way that it straightens instead of concaving. As for the solution... If you've noticed that your action is slightly higher, I would suggest adding some truss rod tension, maybe just a quarter turn or so. If you don't feel comfortable cranking the truss rod... loosen both the trem-claw screws on the back of the guitar. This will relieve some spring tension and lift your trem back to the floating position. Remember to loosen each screw a little at a time. Hope this helps you out, Good luck