Can you move the head easy by hand when the machine is off? You should be able to move it quite easy, if this is not the case then your axes might not be square.
Else, check belt tension as yzorg suggests.
(EMI on the endstops is very rare, and I've only seen it happen with a teslacoil)
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yzorg 9
maybe one of the following:
- EMI interference -> one or more endstop cables are passing too near to a steppermotor cable.
Just avoid this and have all wires properly twisted
- belts not tight enough. should hear skipping sound sometimes if this is the case.
Get a upgradepart from thingiverse..
Check the modifications Board here. there are some awesome essential addons for ultimakers
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