You need to pull that south side outlet out to try to identify the cause. If it is just using the push-in contacts on the back, hopefully there is enough slack in the wire that you can connect it properly to the side screw terminals.
If it is instead already on the screw terminals but one is loose, it may have already created some heat or arching and depending on how degraded (whether the other screw terminal on same side is still good and unused) might need the outlet replaced.
Unfortunately this makes the wiring to every outlet suspect, assuming same person did many if not all of them the same way.
Also if you have residential grade outlets, any frequently plugged and unplugged ought to be replaced with commercial grade outlets which have better contacts that keep their spring tension longer, especially if the powered gear uses a lot of current (which your laptop and phone charger obviously do not). If unsure which grade they are, there are some youtube videos showing the construction differences, at least of the popular brand Leviton.