Plugging iphone into PC causes keyboard delay in online game

I keep a charging cable always attached to my PC for convenience. Recently this failed so I bought a 2m replacement rather than 1m, from apple store.
I play starcraft 2 for fun, and I have noticed that whenever the iphone is plugged in (iphone 6), it causes massive delay in keyboard commands executing within the game. This delay is up to 1-2 seconds.
- The game otherwise runs at normal speed, no lag
- No difference whether keyboard plugged into USB or through PS/2 adapter
- Mouse (USB) is not affected
- Does not happen with 1m cable, only 2m
- No other attached USB peripherals cause the delay (printer, scanner, mouse)
- The instant I unplug the 2m cable, the delay goes away
- It appears to happen no matter which USB ports I use for lightning cable or keyboard (black, blue or red)
Any ideas? Any way to stop this? Should I just always unplug it once I get into a game?
Thanks

I will add that this delay affects only the game, there is no keyboard delay in any other functions.

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Plugging iphone into PC causes keyboard delay in online game

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