Yes, mine also did that on one side for a while. And yes, I too found that it was an intermittant bulb failure (you know, like the filament barely making contact and sometimes failing). The factory uses a solid state relay controlled flasher, and they are made to blink fast when one bulb looses contact as a way to notify the driver that a bulb is out. I think it might even say about it in the owner's manual. So shortly after replacing that one bulb, another failed, so I just replaced ALL the rest (since they all have similar usage on them), and now I've never had any problems since
'95 CONTOUR SE
-Enkei 16s
-Porsche944 Exhaust tip
-
Audi xenon projector headlights
-Peterbilt 30" air horns
-mp3 Aiwa headunit (150 songs on one disc)
-dual 10s
-soon to have LED tailights (real kind, not just gay bulbs)
-That's it for now