Early reports of the One UI 5 beta are favorable mentioning the performance and battery improvements
While I do not refute the experiences your having with your phone all I can do is pass comment on the experience I've been having with my Samsung Galaxy s²² Ultra 256Gb in Phantom Black Exynos SoC.
The only issue I've had is a scrolling issue with the Twitter App.
Network Signal and Data i.e 4G and 4G+ has been strong in most places I visit. Sometimes I've used a secondary network sim card if the network signal and data connection isn't strong in a particular area. I do not use 5G.
I prefer to remain on Mobile Data connection but when I'm at home my phone is set to automatically switch to Wi-Fi which is stable. I prefer not to use public Wi-Fi no matter how secure it seems.
The apps I use both pre installed and my downloaded one's appear to be fine however I do not prefer to use Google Apps , Google Chrome included as well as Microsoft Apps. I just don't have a use for them so I uninstall the one's I can and disable / force stop the others.
If I had issues I certainly would send feedback to both Samsung and the app developers.
I've seen posts where a particular phone has had connection issues and unfortunately no end of self help troubleshooting would possibly help with that. I had a similar issue with a Samsung Note²⁰ Ultra.
I would suggest that an owner within their cooling off period asks for replacement or if beyond that seek support from a Samsung Service Centre or from the source that supplied the phone originally if not direct from Samsung.
One of the generic troubleshooting tips is to clear the phone's system cache partition files i.e > Clear Cache Files from the phone's System Partition Section > https://www.samsung.com/uk/support/mobile-devices/how-do-i-clear-the-cache-on-my-device/ You may need to insert your earphones or hook upto a powered On Laptop to access the Clear Partition Section. This may help with lag or stutters as this clears the phone of old/unused or broken cache files.There is also a Repair Apps option in the Menu System too. However if the phone's core issue is the connection to Signal i.e hardware related then that wouldn't help in that instance.
I've owned both Snapdragon and Exynos versions of Samsung phone's and find that the optimisation on the Snapdragon is better which provides better battery stats.
It feels a little more fluid too.
Daily Driver > Samsung Galaxy s²² Ultra 256Gb in Phantom Black.
The advice I offer is my own and does not represent Samsung’s position.
I'm here to help. " This is the way. "