WiFi, USB and webcam issues (bus related?)

Hi,

I've got some issues with WiFi, USB and webcam which usually erupt when my MBP (early 2015, 13 inch) is under load for minute or so. It's running El Capitan 10.11.3, and I do not know if the errors were present before since I got it just two weeks back.

My minimal working example is using the flash-version of twitch.tv and watching any channel sending a 1080p/i stream. It takes seconds before WiFi goes down then, and sometimes my USB headset stops working as well and the webcam resets. The WiFi reconnects after a while though, the broadcom chip is being reset and when it's up again it's up.

The following usually shows up in the logs:

01/03/16 23:02:37,000 kernel[0]: ARPT: 63809.964428: wl0: fifo 0: data error

01/03/16 23:02:37,000 kernel[0]: ARPT: 63809.964435: wl0: fatal error, reinitializing, total count of reinit's[50], @'wlc_bmac_fifoerrors':9913

I haven't found any way of solving this so far, I've tried googling a lot and talking with friends who have more experience with Macs than me, but it has led us nowhere.

And I've tried all the "Fix WiFi issues" post or solution I've found anywhere on the web for MBPs. But what I find interesting is the lack of google results for wlc_bmac_fifoerrors which points me in the direction that it might be a very rare bug, even a hardware bug?

Error by USB audio:

29/02/16 09:34:05,000 kernel[0]: WARNING: AppleUSBAudio has detected that a connected USB audio device is sending too much audio data.

29/02/16 09:34:05,000 kernel[0]: WARNING: This USB audio device may not function properly. Please notify the device manufacturer.

Error by webcam:

28/02/16 23:16:52,290 AppleCameraAssistant[4824]: FrameReceiverMessageCallback: KernelFrameDropNotification (Frames are dropping). The firmware is not returning buffers quickly enough.

They all lead to the same issue, reinited wifi, reset / non-working usb and reset webcam.

If i had access to the firmware I would simply update it and see what happens, but since I do not have that (Apple policy I guess?) I feel quite handfallen.

(this is basically a duplicate of a SE question I wrote a couple of days ago; http://apple.stackexchange.com/questions/229172/issues-with-wifi-seems-bus-relat ed-under-load)