Connecting some USB 3.0 devices interrupts charging and wifi

I have a very strange issue:
when connecting my USB 3.0 hard drive (3,5" with its own power supply) or my USB 3.0 hub (also own power supply) to my 2013 Macbook Air the charger will stop charging for a brief moment. The red or green light on the connector will go off and back on after about one second. This is not very annoying during normal use, but when connected to a external monitor, the latter will also switch off. On the other hand, smaller things like my USB 3.0 USB stick or my 2,5" USB 3.0 harddrive do not have this problem. Is this somewhat related to the external power supply of the hub and hard drive?
Another problem I have: When the hub is connected, wifi will stop working completely. I suspect the USB cable, which was quite cheap and is very thin. (Google says that a bad USB 3.0 cables radiate in the same 2,4 GHZ frequency as Wifi), however this only happens on the left USB port. All of this has been driving me crazy. Thanks for reading!

Hi there kuerbiskopf,
I would recommend resetting the PRAM and SMC as an intial troubleshooting step. Take a look at the articles below for more information.
About NVRAM and PRAM
http://support.apple.com/kb/ht1379
Intel-based Macs: Resetting the System Management Controller (SMC)
http://support.apple.com/kb/HT3964
-Griff W.

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