Hi all. About 8 years ago we replaced 2 huge, ugly hanging lights over our kitchen counter with 2 very simple ones. Anyhow......one of them has for awhile, flickered a little. I usually just tighten in the bulb and it's okay for awhile. But lately it's gotten worse. It makes a grinding sound when I tighten it. The bulb is fairly new. Does this mean it will eventually not work? I'm sure the problem is within the lamp and I'm not sure they still make this model. Any ideas or suggestions what might be causing this and if there's anything I can do to fix it? thanks!