It sounds like something made its way to the drain impeller. It's pretty common for broken glass to make its way in there, I've never been inside a 18-20 Hobart Kitchenaid dishwasher that didn't have broken glass in the sump.

It's pretty straightforward to dig in there and check. Remove the wash arm (pulls straight up, there's no fastener) and filter. Remove the screws (28) that hold the upper support in place (29). Remove the wash impeller screw (1) and associated hardware (2, 3, 4) (keep it all in order). Remove the wash impeller (5), lower housing (7).  Remove the screws (27) to the cover (26) and remove the cover. Remove the drain top (8) and you should be able to see what's in there. If you find foreign objects in there like glass, inspect the drain impeller (13) for damage. Don't lose the washers/shims above drain impeller (9, 10, 11) they're essential for proper spacing of the wash impeller.