rMBP 2015: Logic board problem or something else?

[logicstudiouser]

Recently, I have noticed that every time I plug in my iPhone with a USB cable into my MBP, it goes in and out of charge every half second. The USB cable works fine when plugged in directly with wall charger and I have removed any lint build up in the charging port of the iPhone.
What is strange is that I can plug in USB sticks just fine and it will not be constantly ejecting, so I wonder if this could also be a software glitch.

 

[Audit13]

It may be that the port cannot supply enough voltage/amperage to charge the phone.

 

[Natzoo]

Recently, I have noticed that every time I plug in my iPhone with a USB cable into my MBP, it goes in and out of charge every half second. The USB cable works fine when plugged in directly with wall charger and I have removed any lint build up in the charging port of the iPhone.
What is strange is that I can plug in USB sticks just fine and it will not be constantly ejecting, so I wonder if this could also be a software glitch.

I have been in this situation, it only works with the apple brand, i have amazon basics and a belkin cords too and both of them do that quick in and out of charge.