If I remember right mine did that once when I ran out of fluid to push the jacks down any farther. I was pretty out of level though so some jacks were very extended and I think used up all of the fluid in the reservoir before the last jack came all the way down.
I had already driven onto some blocks because I had been trying to keep the front tires from coming off the ground and I had to find more blocks to put under the jacks too so that they weren't over extended.
Mine usually lifts the front first to just a bit above level and then lifts the back one side at a time, and my last rear jack I think just didn't have the fluid left to get all the way down. After stacking blocks under the front jacks and re-leveling again the jack made it down and the blinking didn't happen.
Might also want to verify the jack fluid level is full but remember you have to do that when the jacks are retracted or you will overfill the reservoir and then when the jacks are retracted the reservoir will be overfilled and might make a mess.
