How many K850s have you gone through?

Posted by cmulc
I was just wondering as I'm about to receive my 4th K850 from o2 , how many others had also gone through ?
My first one lasted about 3 weeks with the operation failed fault.
My second lasted a good 3 months before with the brod whis was before R1EA software update.
And my third has lasted almost 2 months before the middle touch sensor went crazy , by working when you'd press any other button or any part of the phone , including the side , but not the middle touch pad.
At least o2 have said I'll be entitled to a different choice of handset if this one goes wrong , ( I give it 2 months) I dont' really want to go away from SE , as I've really loved some of their handsets , since I've owned a t310 , t610 , k700 , k 750 , w810 before. , I'm back using the t610 which is a fantastic phone to hold and is a piece of art.
So has anyone beaten 4 k850 handsets ??