Try updating with the 1.34 .exe and .nbh once you have managed to get to 1.34 the first time (ie just run the updater direct as you should normally)
My OS is 5.1.465 (Build 15618.104.22.168)
Radio Version is 1.38.00.10
So I guess that would make it AKU 3.3.1
No problems with it so far and have unlocked it to import the Vodafone settings as I would before, now to restart my mission to actually be able to load the UK Vodafone wap sites.
I had the same problems with my phone really bad. Finally got fed up and sent it for repair.
Got it back about 10 days ago, and haven't had any problem since. I'll wait another week or so before I really give it a clean bill of health.
The fix was quite simple... They replaced the mainboard... So it seems like there really was a hardware problem.