Hi John, Thank you for your question. It is possible that some debris could be blocking the hot water flow. First you will want to turn off your water supply. Disconnect the hot water supply line and place the line into a bucket, turn on the hot water and check the water flow at this point. If water flow is low, the stop valve is the most likely issue, if the water flow is good there is probably debris in the faucet. Reconnect the supply line and with the water supply off remove the handle, cap, cam and packing, and the ball assembly from the faucet. Make sure that the seats and springs are clear of debris. Reassembly the faucet, but remove the aerator. Turn the water supply and the faucet on and let the water run for a minute to flush the lines.
I have attached the manual for your model below that contains the parts breakdown which will help you with your repair.