Missing moths worth of footage

I installed my ring came around Feb time . And have been using it with no issues. Just today I've gont to check some footage from the start of April to realise its not there in fact there's a whole amount of time missing the camera was installed so that I could keep a record of interactions with an abusive ex and now they have all gone. Help please this is evidence for court. I'm on Andrioid if that makes any difference