Hi @suemackeown13 ! For this issue I would check to see if there are calculated fields used in expressions which could be throwing an error for a single result or small sub-set of results. I would recommend to simplify the GI results by trimming the results, conditions, or even relations until the GI is able to be loaded via OData and then build back on to it until it is easier to identify which part is triggering the error.
Sometimes I’ve seen something like an expressions which relies on a calculation and can throw a divide by zero error for a single result, which the GI may be able to handle and still display results, but if there are any errors in the GI when attempting to grab over OData this will almost always result in failure.