Unofficial chargers causing jerky / choppy / jumpy / inaccurate iPhone touchscreen

Today I finally discovered the cause of an issue that has bugged me for over a year and wanted to share it here. Basically I was having lots of issues with the touchscreen being jerky / choppy / jumpy... It kept being inaccurate, thinking I was tapping in the wrong place, it wouldn't scroll smoothly without jumping around etc etc, you get the idea. I've finally figured out that it only happens while charging and only if I use some third-party (non-Apple) chargers.
It ties in with this archived thread as well - https://discussions.apple.com/message/9832369#9832369 - but the archived thread doesn't specifically identify that the cause is unofficial chargers.
The type of charger causing this issue for me looks like an official Apple one but it isn't. Here's a photo:
I bought a few of these cheap chargers a while back so I could keep a couple around the house and one at work. I frequently use my phone while charging, sat on the sofa, watching TV, etc. Today at work I was using my phone fine, then plugged it in to charge and noticed it started being jerky. So I unplugged it and the problem went away. Naturally I plugged it in and unplugged it again a few more times just to be sure the problem was being caused by this and it definitely was.
It so happened that I had an official Apple charger at work as well, so I swapped over to this (using the same cable) and guess what - the problem disappeared again.
This does not affect all non-Apple chargers though... At home I now have a couple of four-port USB charging units. One from PortaPow and another that is a generic white one from eBay. Both of these are able to charge my iPhone without exhibiting the jerky touchscreen problem. However it's worth noting that both of these can supply decent amps (2.1A, or even more) whereas when I measured the charger shown in the photo using my USB volt/amp meter it was topping out around 0.7A-ish.
Anyway, I hope this thread might be useful for other people who are perhaps tearing their hair out trying to work out why their touch interface is being all choppy and inaccurate. Hopefully I've included enough different words for "jerky" to ensure this thread is found when people are searching for the issue.

I see the same behavior with my iPhone 5 using a Belkin B2E027 4-Port USB Power Charger. I suspect that this is due to conducted noise on the cable from the switching converter in the charger. I might try adding a ferrite toroid to the cable to see if that helps.

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oh... its fixed ...whew...that was scary...I'm glad its Okay now.
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Unofficial chargers causing jerky / choppy / jumpy / inaccurate iPhone touchscreen

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