Thanks so much...
I initially tried a generic super glue, that was probably a little too old -
Then, got Goo Gone, cleaned the case, and the magnet - and at your suggestions purchased actual Krazy Glue..
It has been 3 days now and it works perfectly - absolutely love the M2 - so clean looking, and ZERO shaking or movement with phone....now just need to remember to NOT look at my awesome phone while driving