Are you using glue stick on the bed?
"UHU stic" and "Purple Elmo's" both work very well for getting ABS to stick to a glass bed. I think the Purple Elmo's goes on a bit smoother, but they're both good. I've found it goes on better if you apply the glue stick when the bed is cold. There are likely other flavors of glue stick that will work, but of those I've tried, I know those ones will do the job. One word of caution, though, is glue sticks are NOT all the same. Some work great and some don't work at all.
For the ones that do work, the print just plain won't come loose until the bed temp drops below 50C. If your bed is level and is holding a temp around 100C to 115C for ABS, I'd suggest putting down a layer of glue stick to see if that cures the problem.