Latest problem with my Sylvania

[veg-o-matic]

Well, so I was watching "A Christmas Story" on my still-unconverged Sylvania 25LC105 when suddenly the volume shot up to ear-splitting level.

Even if I turned the volume all the way down, it was still terrifyingly loud.

Then just as suddenly, it went back to normal.

Any ideas? This set still has plenty of issues besides the volume--need a new convergence board, the color still doesn't sync for a while, fine-tuning is touchy, etc. But at least the other problems don't disturb the neighbors or scare the dog!

veg