occasionally the rear case fan isn't functioning properly
occasionally the rear case fan isn't functioning properly
I'd say it's like a bad motor, but either way, the fan needs to be replaced. Do-it-yourself options usually come with decent low-cost cases, but achieving those low prices requires compromises, and here it's true—the fans are also quite cheap. You're looking at two 2x PWM system fan headers; if they're not being used for a radiator, I'd opt for three good 120mm PWM fans (top two on the splitter) and run them all at low speed (400-500 RPM at idle, up to 800-900 at max), which would result in a very quiet case.
There might be a fan requiring higher voltage than the other cases. If the case is new, contact the vendor for a replacement fan.
I'd say it's like a bad motor, but either way, the fan needs to be replaced. Do-it-yourself options usually come with decent low-cost cases, but achieving those low prices requires compromises, and here it's true—the fans are also quite cheap. You're looking at two 2x PWM system fan headers; if they're not being used for a radiator, I'd opt for three 120mm PWM fans (top two on the splitter) and run them all at low speed (400-500 RPM at idle, up to 800-900 at max), which would result in a very quiet case.