it is randomly adding the loop word in the code

[DevulskyA]

it is randomly adding the word "loop" in the code

[retailcoder]

Not quite randomly - the line you're hitting ENTER (or TAB) on contains the keyword Do (apparently it could be in a string or a comment).

This is a known autocompletion glitch, will definitely be fixed by the 2.3 green release.

[retailcoder]

ref. #4168

[retailcoder]

In the meantime you can tweak autocompletion settings, and turn off the buggy block completion.