Although it happens in the middle of the night, its probably not gremlins. I would check the condition of the registration clutch. You can also have...
In my experience on this model, most often the problem is caused by the toner hopper. On many machines I've serviced with a false add toner message,...
They are both very similar. The 7525 is the newer version of the 7425. If you can get a better price for the 7425, get it. If the price is nearly the...