Intermittent camera fails to record

I have 2 floodlight cams and a doorbell cam but it seems that not every motion is recorded even when there is a large motion. My daughter came home last night and drove up the driveway (which 2 of the cams normally record) and into the garage. Neither camera recorded and stored that in the history. The cameras are working fine and have up to date firmware. They recorded my dog walking around the driveway this morning and cars coming and going thru the day yesterday. Wifi strength is good. I have this same problem at my church. Where we KNOW that someone (often me) came into the building at a specific time but there is NO RECORDING. people coming and going before/after are recorded. This is a security system - the recordings must be reliable! What's up? I have called support and they walked me thru the usual stuff of checking the firmware version and rebooting but I was not at home so we couldn't test it. But I suspect the cam will work just fine when I test it since it does seem to record most activity - but not 100%!