Not only do I have a number of books and magazines written both in english and german about the subject, there are a number of museum's here in Europe I have visited that have a Panther, and yes during my National Service as a tank platoon commander, we had retired tank commanders speakers both from USA , Israel and Germany and England giving thoughts about tanks in general and specifics tanks.
I even used to have the keys for one tank museum for a while ( we mostly had swedish stuff, but also a swiss hetzer).
Yes tank break down, so did our tanks - how many depended on various conditions, how hong they where put out of action depended more on supply routes and logistics than anything else. Most repairs can be done in very short time if you have the spare parts.
Your sad devotion to this ancient myth is noted. If I am wrong then it is because I have been led to that conclusion by reading dozens of books about the tanks in service, a comparison of the M4 and Panther (specifically) by Zaloga, and been to museums in America and across Europe where I have spoken with the men that maintain these tanks today.
Several of those sources stated just what I have word-for-word, which is why I repeated those same statements here.