I've owned a 95ES for about four years now and set to "low", the lamps (three, so far) have always started to flicker once it reaches 500-600 hours. Running it on high will always mitigate the flicker, until very shortly before the lamp completely burns out.
This is a really maddening problem. The projector is too close to my head to comfortably keep it on high, due to the increased noise. If it's on low and you prefer it stays there, then after the flicker first starts to materialize, you can temporarily flip it to high for a couple days, then back to low and the flicker will stay away for the most part, for maybe a hundred hours or so, when you have to repeat the temporary flip process until the bulb dies out.
I had to send the unit in to Sony about a year ago for an intermittently loud fan replacement (running on low) and they replaced the fan, but didn't address the flickering problem at all. It appears that Sony must want to avoid talking about this problem as much as possible. It's incredibly annoying though.
My prior projector was a DWIN Transvision 3 and going through three or four bulbs with that projector - none of them ever flickered.
With respect to the Sony lamps, I do believe that there is somewhat of an issue with the bulb manufacturers. Two of my three lamps have been what Sony would consider "their" lamps, but the third one I bought from an online retailer and that one was definitely worse. That one flickered like crazy after 500 hours and completely burned out after 1,350 or so hours. The other two have lasted over the 2,000 hours mark.
Not being at all savvy with the technical aspects of the inner workings of electronics, it is nonetheless inexcusable for this flickering problem to persist without some sort of remedy, by ANY of the manufacturers - either makers of the projectors or the bulbs. Especially when one spends $2,000 to $8,000 for the projectors.