[Plugin: Easy Restaurant Menu Manager] htaccess file changed

My website is continually being downed on a fairly regular basis (~4-5 times a week) by a corrupted htaccess file. This causes it to display a 500 internal server error. Whenever it happens i just replace the htaccess file with the original and it works fine (short term fix).
The htaccess file seems to get randomly jumbled up a little differently each time it happens. Some times it will simply add an extra ‘>’ and sometimes it will duplicate random chunks of code (examples below).
I have found numerous threads describing similar problems (with ‘s’ or ‘ss’ added to the end of the htaccess file etc.) but none exactly like what I am encountering.?I been through many programmers who have found the problem… which is the EASY RESTAURANT MENU MANAGER PLUGIN, could you please help me to stop this issue.

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