As most of us have experienced the ineffective suction cup to permanently stay on, there has been many options and solutions stated.
The outer edge of the suction cup appear everted and lifted off the glass and there is no good way to completely remove the air pocket from the center. I thought if the everted edge can be corrected a better seal may be possible. I used a black hair band the circumference of a $1 coin and around 1/4 inch thick when not stretched. The size does not have to be exact. I rolled it over the camera attachment and placed and tucked it between the suction cup and the body of the mount that covers the cup. This was done AFTER the cup was placed on the screen and before attachment of camera.
I have had no drops since. Although the weather has not been as hot I think this may eliminate or prolong the mount staying on the glass. This may help with vibration as well.