I have 2 Blink Minis installed which will function for some time and then eventually display a solid red led.
Resetting the cameras via the push button returns them to operational after having them rejoin my wifi network. These 2 cameras are close to my access point and signal strength in the Blink app displays as strong. I have 4 other Blink XT cameras which are outside and further away which do not have this problem.
Blink Minis are at firmware v9.63