@Niloc I probably wouldn't get a Sony again, just because I really love the Samsung Notes with the pen. And they are so damn strong and fast.
With the Sony XZ, I have last years model, I believe the latest is streets ahead of that one. Great camera, but I use phones for calling, emails and texting, hardly anything else except the occasional photo or two. Seriously worth considering for your needs.
The Xiaomi is surprisingly small in your pocket, but bloody slippery if you don't use a case. The case that comes with it is good too, very well made and leather.
People are surprising biased against Xiaomi until they see, feel and use one.
I have no idea why they are like that.
@TheDestiny I use the swipe/swype keyboard app for typing
As I just swipe and type, it's so much faster and Apple can't do that!
Apple people look in awe sometimes and say - "how the hell does that work"?
I use it on all my Android phones.
I think you should let Xiaomi know, I feel they are a great company generally.
And they will happily replace or fix.
Our Xiaomi Note Pro has been going strong for 2+ years and my wife absolutely hammers it with Wechat. (She's Chinese and you'd know how the Chinese are with Wechat). I have not had any of the problems you mention. I bought the Black/gold one and its about 5 months old and is going like it was when new.
Personally Xiaomi are my favourite Chinese brand of phone followed by Huawei and then the rest.