Same problem. It indeed depends on the charger. Similar to what @nicka is saying about “grounding”, I would blame an EMC issue. Indeed, USB 5V adapters are switched-mode power supplies which operates at high frequency (several kHz at least). This can generate high frequency electromagnetic noise which can propagate on the charging cable. If that’s the case, I fear this is a hardware design issue with FP2, which cannot be changed with a simple software upgrade…
For the time being, I’m just using a charger that happens to work 
Also, I didn’t have a chance to test a possible mitigation scheme: some USB cables have a ferrite core (photo) at one end which is meant to attenuate high frequency perturbations. Maybe this can help?
