Long story short, as many FP2 users reported in the forum (here and there) and social media, my phone basically was not performing correctly. Above all, the main issue (at least in my case) was the ‘freezing effect’: that is, micro-stops every now and then when using different apps, sometimes leading to a crash notification from the app (without necessarily crashing) and sometimes just having to lock/unlock screen (or worst, reboot phone). By reading these lines, some of you might already know what I’m talking about.
Well, after basic investigations on troubleshooting FP2, I took the path of trying the Safe Mode to detect heavy apps (but performance was still poor even in safe mode) and, after that, going to Factory Reset (duly following back-up instructions).
That was the solution! I’m writing from new old phone 
), performing quickly any action, no freezes… Happy again!
Hopefully, writing a new post for this was the right path -if not, let me know or take action to merge it wherever it might be correct.
Pere
Edit: I’m on regular FP operating system. I performed the factory reset via the tools in Settings (Settings >> Backup >> Factory reset)
