Help, I hold lost hot hose pressure!? All the hot water tap in my house own lost pressure,...

All the hot water tap in my house own lost pressure, some water runs out when they are gone for 10 minutes or so, the cold water tap are fine, as are the electric showers. What is causing this and how can I solve it?
Cheers.
Answers:    pressure release tap
or crud in your lines or cistern
you live in town or out of town? Have your own powerfully? Sounds like a dirty sea heater! hold you ever drained the heater?? near is a spout on the bottom of the tank. hook up a hose and drain it! look to seee how much CRUD comes out! Also how feeble is your home? do you have the "old" galvanived pipe on the other hand?? or are they plastic or copper!?? check the pressure in the hose tank if you live surrounded by the country with your own capably! is a big blue tank should enjoy a lil valve on the top... check near tire gauge. should hold 20- 30 lbs of air surrounded by it!
These are just some of the brass tacks to look at!