AAM/ignition or CPK?

My 1999 ML320 with over 220K has been running great till yesterday. Went for shopping, and when I start the car just crank two or three times. I tried too many times and the same happen. Check the battery, Disconnect/Connect it and the same issue. Used a booster and same thing happen, it crank two or three times and does not start.
Tow my car to driveway and let it for a while. Check the ODBII, no check engine, no other errors. The car lock/unlock normally. Check all interior/exterior light and wipers and everything working fine.
Tried again, and suddenly the car start normally, I shut it off and tried again. The same thing happen, crank two or three times and does not start.
With a key on the position 1, there was no blinking.

I tried again today in the morning, with the key on the position 1 the blinking was normal and in the position 2 just once. Start the car normally and left it till reach the normal temperature 80 C. Restarted three more time after that and everything seems to be normal.
Anyone can shed some light, what it might be?

Thanks,