After WordPress3.7 it introduced the automatic updates feature. However i found it that sometime automatic updates gets messed-up and it won’t allow anybody to login, So in this
if you are facing a situation where your .htaccess file is automatically getting reset to wordpress default htaccess code than there can be few reasons behind that.
Tips & Tricks
If you are visiting this page than you must have faced the similar login issue, where you have been asked to prove your humanity by entering the maths