Just my update/summary: it’s completely clear that the problems are caused by the watch OS updates from 6.0. Definitely discarded a hardware issue on the phone or watch. I had 2 AW S4, the last one with watchOS 5.2 paired with iPhone SE iOS 13 working perfectly but after updating watchOS problems appear.
My issues: problems with calls, it looks like the AW is calling but the call doesn’t engage with the phone. Siri is too slow or even unavailable some times. Siri goes crazy in the middle of the answers telling “...Uh Oh Lost connection let me try data again...” Impossible to creat reminders from the watch. Impossible to send a WhatsApp to a contact, before watchOS 6.0 I could do that with the AW.
Old issues solved: watch doesn’t recognize my self, turning impossible to call home or a parent or getting instructions to get home adress.
Talked with support several times, scaling to engineering department, I sent some videos with my issues and these days I am going to report time and date details of the issues to monitoring the error code from Apple. Support always ask to reboot, unpair, reset, update, etc. but as is well known that doesn’t work. The only thing I didn’t try and I will not try is a hard reset of my iPhone, I think it’s a waste of time, don’t want to lose data and I don’t think it will solve the problems. I talked with support about this forum where many people are reporting the issues but they are no allowed to enter, read or check these kind of contents.
Hoping that the last beta 13.3 works as Spartan says, crossing fingers but I am still thinking that the problem is the watch OS and not iOS.
Regards
iOS 13.2.3 (iPhone SE model MP822FD/A)
watchOS 6.1 (Apple Watch Series 4 model NU662B/A)