Zoom breakout rooms issue

I wanted to discuss our room breakout room issue we have purchased license of zoom (500 users) and we have created different zoom breakout rooms from the last one month we are facing issue in breakout rooms when we start meetings in breakout rooms our few members were stuck in main room and they were unable to join breakout rooms so that we end our whole meeting and start it again then users are able to join the meeting. It’s effecting our whole workings please look into it and provide us accurate solution on priority basis. Waiting for your kind response. Thank you