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HMMMM....you have a bad capacitor in the deflection area of your TV. This bad cap will raise the high voltage to a level unaccustomed to the power supply. Eventually this TV will shut down. You will need a tech to find the capacitor or two and replace them. This will lower the voltage to a proper and working level. The remote or universal one, will not operate your TV properly at this time. A common problem for your Curtis Mathis. Thanks for asking and show a few hands of support.
Try taking the batteries out of the remote or taking it out of range from the tv. Then try turning the volume up on the Tv manually. If the volume continues to go down on its own then it is a problem with the tv set itself. If the problem stops with the remote out of the picture then it is a remote problem. As far as powering the unit off may be a similar issue. If there is an on/off button on the tv and it works to turn the power on but not off then it is a tv issue. If the remote turns the tv on but not off it may be something as simple as the wrong code being programmed into the remote(universal remote) or if it is the factory remote it may be an issue with that. You could try getting a new universal remote that works with your unit.
It sounds like one of the volume down buttons is stuck in the activate position. The same as if you were holding the down volume button continuously. It could be either the volume down button on the TV or the remote. I would try remove the batteries of the remote then adjust the volume by the TV buttons.
If the volume doesn't go back down then the remote is the problem. In order to fix the remote you may need to take it apart. This is normally easy to do just locate any screws that may be holding the remote together. If you don't see any screws then you will need to pry the two sections apart. Separate the circuit board and rubber buttons and clean them both with some rubbing alcohol and reassemble it. If it still has the volume issue you may need to replace it.
If the problem persists with the remote deactivated then it's the volume button located on the TV. That is a little more difficult. You can try wiggling the button or some canned air (used to clean computer keyboards) to blow it clean. However it may need to be disassembled to gain access to the switches for proper cleaning. Hope this helps.