camera picks up then will have a couple hour gap and no events

Hi my eufy camera will pick up excelently then go dark for a while. Today parked middle of afternoon in driveway emptied car, opened rear hatch graped large tennis bag and nothing. just went out to oick up pakage for neighbor and was recorded even tho i was barely in the picture.( same outdoor light) Last night ring door bell picked up family coming home not the eufy and it was on away and should have alarmed. night before same people and it was set off. Try resetting schedule. and switched cameras and still happened. Any ideas or help . yes i reset the motion zone and same problem. Similar situations and picks up sometime not other