Livestream issues using YouTube and OBS

Anyone else using OBS to stream with YouTube? Our livestream has been working beautifully for months since we updated our internet service, but the past few Sundays the first service has encountered strange issues. Last week the livestream jumped from the livestream to a past livestream from weeks ago. This week it’s with buffering and sound. Does anyone else use these platforms and have any insight? Or who would be willing to talk to our sound person running the livestream? I can’t figure out what the issue is. Thanks!