Now we are getting some place.
Sounds like your dip tube is giving up the ghost.
NOW try the following shut off your Hot water heater Open the drain valve to flush it out THEN with the cold water valve leading to this tank OFF hold your finger on the faucet in question and open the now drained HOT WATER side of the faucet THEN open the C/W side and hold your finger over the spout opening and POW your back flushing all Debris and particles to the DRAINING tank.