Every time I shake my Nexus 5, the Change Keyboard window pops-up.
Please let me know how to turn it off. The Andriod version in my phone is 6.0.1
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Found the issue, recently I installed ICICI app on my phone. Along with this app a keyboard called 'ICICI Smartkeys' got installed which has updated the default behavior for shake gesture on my phone to pop-up 'Change Keyboard' window. Disabling the keyboard fixed the issue.