I have blinked a lot lately but only once while in pack of cars and as soon as it was more than one blink I stayed high to let everyone by then pulled to apron. I wish people would atleast understand how hard it is to race a blinker too. It does seem people blink on grid but that's it too.
There is maybe a easy fix to this, it could be that your ISP had some problems lately, but it also could be the last build.
They introduced dirt build up witch is a layer of graphics all over the windshield. Could be that this made your computer not handling seeing so many cars. So could actually help to lower the number of visible cars.
This layer isn't visible to you, but the layer is there to be rendered even if the windshield is clean.
This is why most people blink on the grid as you can see all the cars when your on the grid.
But I have no idea on what kind of specs you have on your computer so I could be dead wrong. But if I was a blinker I would have used more time investigate that, than racing.
But I saw a guy doing Road America and on lap 8 in Grand Am he blinked 58 times in one lap.. I repeat.. ONE LAP. And I counted it as a spectator, The longest blink I saw was for 2-3 seconds and obviously shorter blinks as well (or else he wouldn't really be there)
Other tings that could cause blinking is other programs using your computer resources. Virus or Spyware could cause your computer to work when you need it to focus on racing.
This program is a powerful tool:
http://www.malwarebytes.org/
As a virus program you should run a free program, and not a fancy program that cost money. Lot's of them daily check if your licence is valid. Resources you could need when racing.
If you have a lot of the word "discontinuity" when checking your laps on the result list you should start with hard boot your Modem/router or what ever gives you internet. Unplug the device, keep it unplugged for 15 seconds and reconnect it. If this does help, but the problem get back within a week, ask for a new one from your ISP.
If it doesn't help you could call your ISP and ask what's the problem keeping a steady connection to the iRacing servers.
IP: 69.25.205.241-69.25.205.249 US servers
And if your on a wireless connection between you and your router you should plug it in with a wire, wireless and gaming is really a no no, I know it works, but that fact actually hurts me when saying it. Because in lots of cases it works like a turn signal..
And take this as a helpful post, no need to prove me wrong. I'm not the guy blinking