Yes it's a known fact about those bugs, but lots of people solve that by hard reseting their devides after the update to GDR2 and GDR3. Many people do the same mistake. After update to GDR2 & 3 the device hard reset itself and they think thats enough, but it is not. After that hard reset, the device will turn on, you will do the initial settings and wait for about 5 minutes, so to be sure every process is up. Then, do the hard reset again. Settings>About>Reset Phone. I hade few friends with ATIV S's had the same problem as you and when i told them what to do they said "But the device hard reset itself after update!", then i hard reset their devices again after that and all known bugs were gone. Anyway, if i get it correctly, you are stuck on GDR2? What CSC's you had on your phone? Do you have ATO or NEE? You know how to see that, right?