2015 A3 - GPS not working, custom ROM solving that? - Galaxy A3, A5, A7, A8, A9 Q&A, Help & Troubleshoot

Hi!
My wife has a Samsung A3 2015 that she's in love with and won't change for anything. There is 2 problems with it though that she has to deal with.
Problem 1: Gps is not working properly, this is using google maps (haven't really tried other apps). The GPS can (with minor struggles) tell us our current position, but nowhere as smooth as you wish a GPS to be, like for example driving a car. If we have it like that, it can for example be frozen, after 2 minutes, get that position, freeze again etc.
My idea was that a new ROM could solve this, maybe? We've tried to factory reset the phone, update maps, update the phone, turning on/off the phone, most basic stuff, but the GPS has never been working properly since she got the phone.
Problem 2: Unresponsive/random touch. This is everything from the touch typing a bit as it wants to it just freezing and hanging. This has kept happening after factory reset too.
Is a new (custom) ROM an option to try, if so, which ones are there for a 2015 A3? If a new (custom?) ROM isn't an option, is there anything else worth to try? Maybe some new firmware or such that you manually have to flash? Not currently sure what version she's using.
Any input or help will be greatly appreciated
(just wanted to consult some more experienced people before perhaps bricking her phone...)

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