JoPa;
Are you using a pressure regulator? This could be your problem because sometimes they change, even to the point of shutting down completely. Also, have you checked the screen at the water inlet where your hose connects? They will plug sometimes. Do you use a water filter and has it been changed recently? Have you checked the water pressure at the source with a pressure gauge? If the pressure is less than 30 psi, you will not get a strong flow at the toilet. I don't think that the toilet would show up before the rest of the faucets if it was calcium build up. Just some things to check.
John