Mitsubishi ws-55809 goes to white foggy screen occasionally

Hello, I have a 2001 Mitsubishi ws-55809 that about every hour or so the screen will get kind of white cloudy picture for a minute or so. You can see images and slight color but this white cloudy washout haze is over the entire screen then it clears up instantly. Sometimes it will be fine for 2-3 hours and other times it will happen 2x in one hour. Sometimes it is this way as soon as I turn on the TV. So far it has always cleared up in a minute or two. I did have the purity/convergence Circuit and transistor/IC components repaired about 16 months ago due to intermitent picture bows. (parts IC- Integrated Semi-Conductor, and qty 2 261P150010 stk392-570 IC) Any idea what this may be and cost to repair or is it time for the trash ! ? ? thanks