Unauthorized Access

I had at least 8 unauthorized access log ins on May 28th at 9:57am. My cameras record 24/7. Just looking back at everything I noticed that lot of my streams have been deleted. There are also expired streams in future dates which makes sense because the system over rides the memory. Also looking back thru the videos I noticed a little orange line where someone viewed live streams randomly while me and my wife were both sitting on the couch and then right after video was deleted. I have a camera over seeing my living room for dogs when we are not home.