Galaxy S6 :: Programs / Apps Repeatedly Switch Between Each Other

My wife's Galaxy S6 is only a 4 months old and for the last 2 months she has been dealing with this issue of her phone just randomly switching between apps and programs. For example her phone will just be sitting on the table and we hear a clicking noise (the same noise like when you text) so I look we look at phone and it's switching between messages, pandora, phone list etc. there is not set of apps/programs it chooses them at random. I tried shutting down some apps and no good. I called AT&T and they had me do a factory reset of the phone, no good.

Took it to the store and they sent us to the service center for replacement. But when we got there they said there is water damage to the phone so we are SOL. She works at a hospital and when she comes home, all she does is wipe down the phone with a baby wipe and that's it. I tried to explain to them I understand where they are coming from but this is clearly a software issue. They are refusing. I told them I work in the IT field and again it's clearly software issue or a lemon device, but they are hanging their hats on water damage of course.

So my question to you all, is there some way to roll back the software or to jailbreak it to fix this issue?