Stick up cam freezes after motion detection

Hi - I've had my battery stick up cams for over a year, and recently they've both started freezing at random. Following a motion detection, they start recording (but video only reflects a couple of seconds of motion). Footage afterwards is marked a "unavailable" but blue light on camera stays on, draining the battery. Device health in app still shows as "Online". I can reset by removing and reinserting the battery, but defeats the purpose of having security cameras if I never know whether they're actually detecting motion or not! Firmware on both cameras is showing as up to date. Any help appreciated