Sony SXRD flickers intermittently after bulb replacement

[Sylin]

So, I just replaced the bulb in my 50" Sony SXRD (KDS-50A2020).

Everything was great for a few days. And then I noticed that the screen is flickering from time to time. Sometimes for minutes... sometimes for hours on end. It's VERY annoying.

Has anyone else encountered this problem?

I've read online that changing the Power Save settings seems to fix this for some people. I turned it Off, and the problem temporarily corrected, but returned about a day later.

I've also noticed it doesn't do this on very dark images or very light images, but in-between or high-saturation screens (like the PSN store, for example) seem to be affected more (or perhaps I'm just noticing it more).

I'm WAY out of warranty so I hope this isn't an expensive fix. I've submitted an RMA request on the bulb but I am not holding my breath with this online vendor.