The solution is to not use your bluetooth OR watch? Seriously? Personally I don't have a VPN so that's definitely not causing it for me on my 14 pro, but this didn't used to happen on my XS when paired with Apple watch 4 - they worked together without issue at all for notification sounds.
My Siri is doing the same as yours, it's extremely buggy, the wrong one activates regularly (i.e. phone will when watch is the only one close enough to hear what I'm saying), mis-hears me WAY more frequently etc. I did get some improvement when I downloaded a new siri voice in another accent, then went back to my original voice, I found that tip online and it did help a bit.
Anyone have a fix on the camera over-contrast and over-colourisation issue? Or third party apps being unable to focus? Camera issues are making my iphone 14 pro practically unusable, the photos are so bad, I have to heavily retouch each one and even then, the over-processing still makes it almost unfixable without taking it to photoshop or similar. Keen for a solution.