4 Years Later, Attaching Rearview Mirror Again — Glue attached to windshield

4 years after my first video showing how to re-attach the rearview mirror, it fell off again. While I am glad that it lasted 4 years, it tells me that something is not right. I am not sure why it came off, so I will experiment more and share the results with everyone. I have two options:
1. repeat the process and see if it works.
2. find the reason it failed and do things differently.
Since the rearview mirror repair glue/kit is only $2 at Walmart, it is sensible to first try #1. If it does not work, then I will try something different.

The video of re-attaching the rearview mirror is shown below:
Rearview Mirror Repair –Glue attached to windshield