Do your handles have a small hex head bolt that snugs down through or onto the surface of the glass? If not perhaps seek newer ones that do that as then you have some mechanical force. In addition some double sided tape may help. I had the same issue as you until I got the bolts that snug onto the glass with rubber gasket also installed
Not sure how easily they are being knocked off, but if the doors are being slammed back/forth, may be better to reattach handles, than replace the glass.