Serious hanging problem in Microsoft Flow

I got a list on SharePoint Online, which is a typical list with some single-line col and one lookup field. I create a flow to get all item from it (no filtering), then use “Apply to each” to loop through all items. For testing, i got two identical loops. After i run it, one successful passed through, one is handing. I have waited over 20 hours but the flow is still hang. I think it is an obvious bug.