1992 Rear View Mirrior

I have a 1992 Jeep Cherokee with the rear view mirrior that has a metal piece that is glue to the glass then the rear view mirrior slides on. In the past year every time I glue the mirrior back onto the glass it would deglue itself from the glass and fall. I've tried just about every type of glue out there and was wondering if anyone new of a solution that could solve my problem. I would appreciate it a lot.

Thanx for your time.