My two Security Cams do not record at night

Hi, my devices seem to stop nearly all recording at night, all they do record is a few seconds on the hour, so 11:12, 12:12, 1:12 etc. I’ve had them for months but dont believe they have ever recorded during the night until I started checking. I live is a fairly bust (30 cars) street so always someone coming & going. On Virgin Broadband but internet works fine for other devices, lights etc Any help, ive tried the things i’ve found online